Monitoring & Digital

    Water Quality Testing and Monitoring

    Find the right water quality testing and monitoring partner for your project. Aguato connects procurement teams, project engineers, and sustainability managers with verified providers worldwide. Browse the listings below, or post your project to receive tailored proposals directly from matched suppliers.

    431 providers

    This page is a good fit if you need:

    • Filtration or Ion Exchange capabilities
    • Suppliers with utilities sector experience
    • Providers operating in China or Italy
    Providers
    431
    Verified
    6
    Countries
    38

    Can't find the right fit? Post a brief and let qualified suppliers come to you.

    Post a project

    Find a Water Quality Testing and Monitoring Provider

    Showing 81-100 of 431

    431 results from 431 matched providers

    Brine Consulting logo

    Brine Consulting

    Verified
    Netherlands1-50 employees
    Mechanical Vapor Recompression (MVR) · Atmospheric Evaporator · Spray Evaporator +130 more
    apac · china · europe +3 more

    BRINE CONSULTING delivers senior-level strategy, technical design, and actionable insight across the full lifecycle of water-related challenges. We support clients with advisory and due diligence, advanced brine management and resource recovery, industrial and municipal water reuse, and MLD/ZLD systems. Our team also leads ESG and climate-resilience strategy, innovation scouting, and international development and PPP advisory. With deep specialization in desalination, brine valorization, circular economy models, and high-impact infrastructure, we help organizations turn water and waste streams into opportunities, providing clear thinking, rapid delivery, and solutions built for real-world results.

    Activated Carbon Filtration
    Reverse Osmosis (RO) Systems
    Ultrafiltration (UF) Systems
    +85 more
    manufacturing
    energy-production
    AtkinsRéalis logo

    AtkinsRéalis

    United Kingdom

    Water is an increasingly important but unevenly distributed resource globally. AtkinsRéalis supports the water, wastewater and water-related environmental sectors with services from water strategy planning and flood management to infrastructure design and maintenance. Water supply and quality is constantly challenged by growing populations, climate change, pollution and changing lifestyles – it’s a complex industry which requires the right skills and the right people to ensure that water services are fit for today and tomorrow. Driven by the need to help clients deliver greater value for their customers, we’re constantly pushing research and innovation boundaries with a comprehensive range of services from water strategy planning to infrastructure design and maintenance. In the water industry, there’s no such thing as an off-the-peg project, that’s why we value close working relationships built around the right people. We work side-by-side with our clients to ensure that their water services are fit for today as well as tomorrow, and together, we challenge existing methods and develop new solutions, whether that be the introduction of new assets or extracting more value from existing ones. We have more than 650 professionals committed to the water market around the world.

    Designers
    Acoustic Surveying
    Bürkert Fluid Control Systems logo

    Bürkert Fluid Control Systems

    United Kingdom

    Bürkert Fluid Control Systems are a German and family-owned manufacturer of fluid control products and systems. We were established in 1946 by Christian Bürkert, with our headquarters in Ingelfingen, Germany. We boast 5 factories in Germany, France, the US and China and sales subsidiaries in 30 countries, with over 3200 employees across the world. In addition to 5 Systemhaus’, which work on bespoke and customised solutions in close partnership with our customers. We manufacture over 670 product types, in up to 20 million variants. These include water quality monitors, process control valves, pneumatics, flow sensors, micro valves and pumps, flow meters and controllers. Essentially, we can produce the full fluid control and measurement loop for whatever fluid or gas you are working with, whether this be measuring, controlling, mixing, levelling, dosing and analysing. We also focus on process automation with intelligent communication modules which can be integrated into a process or plant and our online water quality monitoring devices for continuous control.

    Control & Automation
    Environmental Techniques Ltd logo

    Environmental Techniques Ltd

    United Kingdom

    Environmental Techniques was established in 1992 to provide trenchless drainage inspection, cleaning and rehabilitation throughout the United Kingdom and Ireland, with offices in Northern Ireland, Scotland and the Isle of Man. Our fleet of inspection vehicles provide surveying services for wastewater network assets including CCTV surveys, sonar surveys, manhole mondition and dimensional surveys, dye tests and impermeable area surveys. Our jetting rigs provide cleaning, unblocking and degreasing of sewers and culverts. We also provide services for pipeline rehabilitation including CIPP lining, localised patch repairs and GRP lining. In 2017 Environmental Techniques became part of the Aegion Corporation which recently in 2024 rebranded as Azuria Water Solutions. As part of Azuria Water Solutions, Environmental Techniques have further developed their technical capabilities through the use of carbon fibre reinforced polymers and drone survey technology. Environmental Techniques continue to push the boundaries of CCTV surveys and investigation through the use of drone and LiDAR technology. Environmental Techniques work closely with clients to understand the needs in advance of carrying any work out. With close liaison and good communication, Environmental Techniques are able to provide savings and benefits to clients on a regular basis. Specialising in: Sewer cleaning & desilting CCTV surveys Flow monitoring & IAS surveys CIPP lining Robotic cutting CFRP Manhole surveys Man entry surveys Patch repairs Manhole rehabilitation Man entry pipe & culvert rehabilitation

    Mapping & Modelling
    Asset Maintenance & Rehabilitation
    GHD logo

    GHD

    United Kingdom

    We are a global professional services company that leads through engineering, construction and architectural expertise. Our forward-looking, innovative approaches connect and sustain communities around the world. Delivering extraordinary social and economic outcomes, we are focused on building lasting relationships with our partners and clients. Established in 1928, we remain wholly owned by our people. We are 10,000+ diverse and skilled individuals connected by over 200 offices, across give continents – Asia, Australia, Europe, North and South America and the Pacific region. Our integrated solutions address every element of the water cycle – from catchment to tap – for urban, rural and industrial applications. We take pride in offering independent advice on the most appropriate technologies, cost-effective design and methods of construction to maximise outcomes. Our offering includes feasibility studies, planning, design, project management and asset management services, as well as operational optimisation.

    Designers
    Environmental Surveys
    McAdam logo

    McAdam

    United Kingdom

    Established in 1963, McAdam engineer sustainable solutions which transform communities and enhance our natural environment. We provide a wide range of services to support the realisation of our client’s projects, both in-house and with the support of our trusted supply chain. Supporting our technical expertise, we have in-house safety and project management professionals who bring a collaborative and proactive approach to project delivery. We offer a wide range of full project lifecycle services across a variety of engineering sectors including: Water supply and treatment. Wastewater collection, treatment, disposal and sludge management. River & coastal catchment management. Surface water and drainage. Civil Infrastructure and environmental improvement schemes. Recognising that our lived environment is facing rapid change we are developing and delivering solutions that seek to protect the natural and built environment and enhance our community’s wellbeing. We help our clients tackle issues and build resilience to growing populations, climate change, pollution, and changing lifestyles. We help them achieve regulatory and legislative compliance within constrained economic times. This is achieved through collaborative engineering excellence, innovative thinking and strong programme and project management. Our approach to delivery of affordable and sustainable solutions is built upon teamwork and creation of long-term collaborative partnerships with our clients, construction partners and specialist supply chain members. The success of our approach is demonstrated by the longevity of our position on key frameworks and the breadth and scale of projects we have delivered over the past 60 years. Our engineering team has significant experience in client led investigations, feasibility studies, concept designs, strategic procurement advice and construction project management. The knowledge and expertise gained from that experience is successfully applied to detailed design services for traditional construction projects, part of design & build partnerships, and in more collaborative delivery models which use Early Contractor Involvement to drive innovation, risk reduction and TOTEX efficiencies. As part of our multi-disciplinary practice we also offer in-house architecture, project management, Health & Safety advisor, principal design, project supervisor, and design process services to supplement our engineering capabilities.

    Designers
    Architects

    Water Quality Testing and Monitoring: Analytical Methods, Accreditation, and Compliance Sampling

    Water quality testing and monitoring encompasses laboratory analysis, field sampling, and continuous online monitoring to characterise source water, verify treatment performance, and demonstrate regulatory compliance. UK drinking water regulatory monitoring is prescribed by the Water Supply (Water Quality) Regulations 2016 (England) and equivalent Regulations in Wales, Scotland, and Northern Ireland; monitoring requirements are set by the DWI (Drinking Water Inspectorate) through water company monitoring programmes; parameters monitored include: microbiological (E. coli, total coliforms, Clostridium perfringens, Cryptosporidium oocyst count, enterococci, colony counts at 22 and 37 degrees C); chemical (turbidity, colour, pH, conductivity, TOC, THMs, nitrate, nitrite, lead, copper, iron, manganese, fluoride, aluminium, bromide, chloride, sulphate, sodium, ammonium, pesticides, PAHs, PFAS); radiological (tritium, total indicative dose); sampling locations: source water, at treatment works, and at a statistical sample of consumer taps (DWI sampling protocol: random daytime sampling (RDS); fixed point sampling; regulatory tap samples tested at EA/DWI accredited laboratory). Laboratory accreditation: UKAS ISO/IEC 17025 accreditation is required for all laboratories analysing drinking water samples for regulatory purposes in the UK; UKAS schedule of accredited testing includes all methods used (APHA Standard Methods, ISO methods, BS EN methods, EA Method UK); EA works with MCERTS (Monitoring Certification Scheme) for environmental water analysis; MCERTS accreditation covers: water quality parameters (ISO 17025); continuous emission monitoring systems (CEMS); soil analysis.

    Analytical methods for key water quality parameters: microbiological: E. coli and total coliforms by membrane filtration (BS EN ISO 9308-1; Colilert-18 defined substrate method; incubation 37 degrees C, 18 hours; reading MPN or colony count); Cryptosporidium oocyst detection by US EPA Method 1623.1 or BS EN 14764 (12 to 24 L sample through membrane filter; immunomagnetic separation (IMS); immunofluorescence assay (IFA) with DAPI and DIC microscopy; confirmation of oocysts by morphology and fluorescence; detection limit 0.01 to 0.1 oocysts/L); chemical trace organics: THMs (chloroform, bromoform, BDCM, DBCM) by EPA Method 524.3 or ISO 11423-1 (headspace GC-MS; detection limit 0.1 to 1 ug/L; UK regulatory standard: THM sum 100 ug/L); pesticides (triazines, organophosphates, chlorophenoxy herbicides) by EPA Method 8270 or EN 12823 (GC-MS or LC-MS/MS after liquid-liquid extraction; detection limit 0.01 to 0.1 ug/L; UK PCV 0.1 ug/L individual, 0.5 ug/L sum); PFAS by EPA Method 537.1 or ISO 21675 (solid phase extraction (SPE) concentration; LC-MS/MS quantification; detection limit 0.1 to 1 ng/L for each PFAS; sum 22 PFAS UK standard 100 ng/L); heavy metals (Pb, Cu, Ni, Cr, Cd, As) by EPA Method 200.8 or EN ISO 17294-2 (ICP-MS; detection limit 0.01 to 0.1 ug/L; UK lead standard 10 ug/L; WHO guideline 10 ug/L); online continuous: turbidimeters (ISO 7027; 850 nm LED; 0.001 to 1,000 NTU; at filter outlets and distribution); free chlorine residual (amperometric or DPD colorimetric; 4 to 20 mA output to SCADA; 0.05 to 2.0 mg/L Cl2 range; DWI minimum 0.1 mg/L free chlorine at service reservoirs).

    Environmental water monitoring: EA and SEPA monitor surface water quality under the Water Framework Directive (WFD) / Environmental Targets (Water) Regulations 2022 to assess ecological and chemical status (good ecological status target for all water bodies by 2027); WFD monitoring types: surveillance monitoring (representative water body sites; annual sampling for all priority substances; 3 to 6 year cycle); operational monitoring (water bodies at risk of failing objectives; higher frequency, targeted to pressures); investigative monitoring (where causes of failure are unknown). MCERTS-certified automatic water quality monitoring stations (AWQMS) on rivers measure online: dissolved oxygen (DO, optical sensor, 0 to 20 mg/L), temperature, pH, conductivity, turbidity, ammonia (ion-selective electrode or spectrophotometric), nitrate (UV absorbance at 220 nm), TOC/DOC (UV-persulphate oxidation); data transmitted to EA WISKI or Hydstra LIMS every 15 minutes. Groundwater monitoring: EA Groundwater Level (GWL) network of approximately 5,000 dip wells and pressure transducer loggers (hourly or daily frequency); groundwater quality chemistry monitoring at EA compliance sites: quarterly for nitrates and pesticides; six-monthly for metals and VOCs; annual for PFAS (expanding monitoring under EA Groundwater Protection Policy 2022). ISO/IEC 17025 calibration: all field instruments (dissolved oxygen probes, pH meters, conductivity meters, turbidimeters) must be calibrated at defined intervals using UKAS-traceable calibration standards; calibration records maintained for 7 years (DWI requirement); field blanks and duplicates taken as QA/QC evidence.

    Frequently Asked Questions

    How often is UK tap water tested and what is measured?

    UK tap water testing frequency is prescribed by the Water Supply (Water Quality) Regulations 2016 (England) and equivalent regulations in Wales, Scotland, and Northern Ireland. Monitoring frequency depends on the population served by the water supply zone (WSZ): small zones (less than 100 properties): some parameters tested monthly; large zones (greater than 500,000 population): some parameters daily. Key monitoring categories and frequencies: (1) Microbiological: E. coli and total coliforms at treatment works and in distribution: at least weekly for zones greater than 10,000 population; turbidity at all treatment works: continuous (online turbidimeter); Cryptosporidium: continuous monitoring at all treatment works abstracting surface water or groundwater under the direct influence of surface water (GWUDI); (2) Physical/chemical: colour, turbidity, conductivity, pH: minimum weekly in distribution; THMs, aluminium, iron, manganese, nitrate: monthly in distribution for large zones; annually for small zones; (3) Extended parameters (pesticides, PFAS, PAHs, heavy metals including lead at consumer taps): lead tested under the regulatory tap sampling programme (random daytime sampling (RDS) at consumer properties; minimum number of samples per zone determined by DWI; any result greater than 10 ug/L Pb triggers investigation and action); (4) Taste and odour: no numerical regulatory standard; DWI requires 'taste and odour acceptable'; tested by trained panel (ISO 8586 sensory assessors) or consumer complaint response. All results reported in water companies' annual monitoring returns to DWI; DWI publishes summary in annual Drinking Water Quality in England report; any serious event or breach of PCV (Prescribed Concentration or Value) must be reported to DWI within 30 days.

    What laboratory accreditation is required for water testing in the UK?

    UKAS ISO/IEC 17025:2017 accreditation (UKAS, UK Accreditation Service, the national accreditation body for the UK) is the primary accreditation required for laboratories carrying out regulatory water quality testing. Scope: UKAS accreditation covers specific analytical methods for specific matrices (e.g. 'determination of E. coli and total coliforms in drinking water by membrane filtration (BS EN ISO 9308-1:2014+A1:2017)'); laboratories must demonstrate competence in each accredited method through: proficiency testing (PT) schemes (WaterPT, Food and Environment Research Agency FAPAS, RSSL PT scheme; laboratories must perform satisfactorily in PT rounds, typically bi-annual participation; z-score less than 2.0 for 95 percent of results); internal quality control (IQC: blank, duplicate, and spiked sample analysis on each analytical batch; control charts maintained; action limits and warning limits); method validation documentation; equipment calibration traceable to SI units (UKAS-traceable calibration from NPL National Physical Laboratory standards); staff competence assessment. EA MCERTS: Environment Agency Monitoring Certification Scheme; additional to ISO 17025 for environmental monitoring; MCERTS certification required for: drinking water treatment chemical analysis; effluent analysis for Environmental Permit compliance reporting; continuous emissions monitoring. Accreditation schedule: UKAS laboratory schedule lists every accredited test by method reference (BS EN ISO, EPA, APHA Standard Methods) and includes scope limitations; check at ukas.com/find-an-accreditation-body/accredited-organisations. DWI requirement: companies must use UKAS-accredited laboratories for all regulatory monitoring under the Water Supply (Water Quality) Regulations 2016; non-accredited laboratories may be used for operational monitoring (non-regulatory) but results cannot be used for DWI compliance reporting.

    What online water quality monitoring instruments are used in treatment works?

    Online continuous water quality monitoring instruments at drinking water treatment works and distribution systems: (1) Turbidimeters: 90-degree scattered light at 850 nm LED (ISO 7027:2016); Hach 1720E (low range 0 to 1 NTU for filter effluents, alarm at 0.2 NTU per DWI guidance), TurbiMax W by Endress+Hauser, Partech SE500; calibrated with Formazin primary standard (AMCO-AEPA secondary standard); DWI requires turbidity less than 0.1 NTU (100 percentile) and less than 1 NTU (99th percentile) at treatment works outlet for surface water sources. (2) pH: glass electrode combination sensor (Endress+Hauser CPS11D, Mettler Toledo InPro4010SG; range pH 0 to 14; ATEX-rated versions available; calibrated with two NIST buffer solutions (pH 4.01 and pH 7.00); DWI pH 6.5 to 9.5 in distribution). (3) Free chlorine residual: Hach CL17sc (amperometric, 0.01 to 5.00 mg/L Cl2; calibrated vs DPD colorimetric in-situ); BTG Mutek Chlorotrend (electrochemical, low maintenance); required continuous at all service reservoirs (DWI: minimum 0.1 mg/L free Cl2). (4) UV254 absorbance: Hach UVAS sc; measured as specific UV absorbance (SUVA = UV254/DOC); surrogate for NOM and treatment efficiency; Endress+Hauser SpectraSensors UV sensor; alarmed if UV254 rises (indicates NOM breakthrough or process failure). (5) Conductivity: inductive conductivity sensor (Endress+Hauser Indumax CLS50, no electrodes, no fouling; 0.01 to 2,000 mS/cm). (6) Dissolved oxygen: optical (luminescence quenching, LDO): Hach LDO2 (0 to 20 mg/L; no membrane replacement; ATEX option); used in biological treatment and reservoir monitoring. (7) Ammonia (NH4+): ion-selective electrode (ISE) or photometric (indophenol blue): Hach Amtax sc (0.01 to 1.0 mg/L NH4-N), Endress+Hauser Liquiline system CA80AM; alarmed for breakthrough of ammonium from source water or biological instability.

    What is the difference between regulatory and operational water quality monitoring?

    Regulatory monitoring is the programme of sampling and analysis required by law to demonstrate compliance with the Water Supply (Water Quality) Regulations 2016 (drinking water) or Environmental Permit (wastewater). Characteristics: specified parameters, locations, frequency, and methods defined by regulation; must use UKAS ISO/IEC 17025 accredited laboratory; results reported to DWI (drinking water) or EA (wastewater); any exceedance of a Prescribed Concentration or Value (PCV) is a legal breach requiring DWI notification within 30 days; water company liable to enforcement action if regulatory limits exceeded (DWI can issue undertakings, DWI notices, or refer to criminal prosecution for persistent failures; maximum fine unlimited under Environmental Permitting (England and Wales) Regulations 2016). Operational monitoring (also called process monitoring or in-house monitoring): carried out by the water company to optimise process performance, detect trends, and respond early before a problem affects regulatory compliance; higher frequency than regulatory; may use non-accredited methods (rapid field test kits, online instruments); does not need to use UKAS-accredited laboratory; results not submitted to regulator (but may be reviewed in DWI audits); examples: hourly turbidity at each filter outlet (detect breakthrough immediately); daily chlorine residual checks at multiple distribution points; weekly jar tests for coagulation optimisation; monthly chemical dosing stock checks. Risk-based monitoring: Drinking Water Safety Plans (DWSPs), required by DWI under the WHO Water Safety Plan approach (WSP, WHO 2009), require each water company to conduct hazard analysis and risk assessment of all catchment-to-tap steps; monitoring (regulatory and operational) is designed to verify control measures at critical control points (CCPs); the DWSP approach allows the combined regulatory and operational monitoring to be designed as an integrated system.

    Case Study·Drinking water quality compliance and monitoring
    Challenge

    A water company in the North West supplying 120,000 properties from a surface reservoir source experienced 3 THM failures (chloroform sum peaking at 128 ug/L against the 100 ug/L PCV) in 12 months during periods of high autumn catchment colour (true colour exceeding 80 Hazen units), triggering a DWI enforcement undertaking requiring a corrective action plan within 60 days.

    Approach

    A Drinking Water Safety Plan review identified two critical control point failures: (1) coagulant (ferric sulphate) dosing was controlled manually without online UV254 feedback, causing under-coagulation during colour events; (2) chlorine contact time at the pre-chlorination point was insufficient at high flow, generating elevated THM precursor reaction with residual NOM. The corrective plan installed a Hach UVAS online UV254 analyser driving an automated ferric dosing PID loop, a second coagulant dosing point to increase contact time, and an online THM analyser (Myriad THMplus, sampling from the service reservoir outlet) with a SCADA alarm at 80 ug/L to allow operational intervention before the PCV was breached.

    Outcome

    THM compliance restored within 4 months of commissioning; no further breaches in 24-month post-installation monitoring period. Annual regulatory DWI monitoring returns showed THM average reduced from 84 to 42 ug/L. The automated dosing system reduced ferric sulphate consumption by 18 percent (GBP 28,000 per year saving) and improved turbidity at filter outlets from 0.14 NTU average to 0.07 NTU average, creating additional safety margin. DWI enforcement undertaking discharged at the 18-month review.

    Questions to Ask Shortlisted Providers

    1. 1

      Is your regulatory monitoring programme designed around a risk-based Drinking Water Safety Plan (DWSP) framework, and has it been reviewed by DWI within the last 3 years?

      DWI expects water companies to operate DWSPs aligned with WHO Water Safety Plan principles; a DWSP-designed monitoring programme is accepted by DWI as evidence of systematic risk management at inspections, whereas a monitoring programme based only on the minimum regulatory schedule may not demonstrate adequate control of site-specific hazards such as seasonal THM precursor events or Cryptosporidium risk periods.

    2. 2

      For online process monitoring instruments (turbidimeters, chlorine analysers, UV254 sensors), what is the calibration frequency and what is the sensor response time for alarm conditions?

      DWI guidance expects key online process monitors at treatment works to be calibrated at intervals validated by the company's quality assurance system (typically at least weekly for turbidimeters; at least daily verification for chlorine analysers); a sensor response time exceeding 15 minutes may mean that a treatment failure is not detected before affected water has left the treatment works and entered the distribution system.

    3. 3

      Have all laboratory subcontractors been checked against the UKAS Accredited Organisations schedule for the specific methods used in your regulatory monitoring programme?

      UKAS accreditation is method-specific and matrix-specific; a laboratory accredited for THM analysis in drinking water may not be accredited for the same analysis in raw source water; using a non-accredited method for a regulatory sample produces data that cannot be used for DWI compliance reporting and may result in a failed sample being undetectable or unenforceable.

    4. 4

      How is continuous Cryptosporidium monitoring data from treatment works transmitted to your SCADA system, and what is the alarm response protocol for oocyst detections above the trigger level?

      The Cryptosporidium (Additional Measures) Direction 1999 requires continuous monitoring at qualifying works; the response protocol for an oocyst detection event (typically greater than 1 oocyst per 10 litres triggers an internal investigation, and greater than 10 oocysts per 10 litres may trigger a boil water notice) must be formally documented and staff must be trained to respond within the defined timeframe.

    5. 5

      What quality assurance controls (blanks, duplicates, spiked recovery samples) are applied to your field sampling process, and how are these results recorded and trended?

      Field sampling errors (contaminated sample bottles, incorrect preservation, temperature exceedance during transport) account for a significant proportion of apparent water quality failures at UKAS-accredited laboratories; systematic QA on field sampling (including field duplicate agreement within 10 percent, blank results below method detection limit, and spike recovery within 80 to 120 percent) is required to demonstrate that a reported PCV exceedance reflects actual water quality rather than sampling error.

    What Drives Cost in This Category

    Laboratory analytical costs for regulatory versus operational monitoring

    UKAS-accredited regulatory analysis costs are significantly higher than internal operational testing: PFAS analysis by LC-MS/MS (EPA 537.1) costs GBP 250 to 500 per sample at an external accredited laboratory; an internal field test kit (Hach colorimetric) for free chlorine costs GBP 0.20 per test; for a company with 50 supply zones and quarterly PFAS monitoring, external laboratory costs are GBP 50,000 to 100,000 per year for PFAS alone, justifying investment in internal semi-quantitative PFAS screening methods for operational monitoring.

    Online analyser procurement, installation, and calibration maintenance

    A single Myriad THMplus online THM analyser (GC-based, sampling once per 20 minutes) costs GBP 35,000 to 55,000 installed; annual maintenance (consumables, calibration gas, lamp replacement) GBP 4,000 to 8,000 per year; compared to the cost of a THM compliance failure (DWI enforcement undertaking, public communication, corrective action programme, potential penalties) which routinely exceeds GBP 200,000 per event, the economics of continuous monitoring are straightforward for high-THM-risk sources.

    Proficiency testing (PT) scheme participation and laboratory accreditation maintenance

    UKAS requires accredited laboratories to participate in PT schemes (WaterPT, UKWIR PT) at typically bi-annual frequency; PT round participation costs GBP 300 to 800 per round per parameter group; UKAS surveillance audit fees GBP 3,000 to 8,000 per day (typically 1 to 2 days per year); accreditation renewal GBP 5,000 to 15,000 per 3-year cycle; smaller water company laboratories operating 10 to 20 accredited methods spend GBP 20,000 to 50,000 per year on accreditation maintenance, which must be included in the water quality monitoring budget.

    Contamination event response and incident investigation costs

    A DWI-notified water quality failure (PCV exceedance for a microbiological or chemical parameter) triggers an investigation that typically costs GBP 20,000 to 80,000 in analytical, staff, and communications costs; a boil water notice event serving more than 10,000 properties requires bottled water distribution (GBP 5 to 15 per property per day), customer communications (GBP 20,000 to 80,000), and post-incident DWI reporting; investment in preventive monitoring (online THM, continuous turbidity, Cryptosporidium monitoring) is routinely cost-justified against the expected cost of 1 to 2 averted incidents per decade.

    Key Regulations & Standards

    Water Supply (Water Quality) Regulations 2016 (England) - Monitoring Requirements and PCVs

    WS(WQ)R 2016 Schedule 1 sets Prescribed Concentration Values (PCVs) for 50+ parameters; Schedule 5 sets monitoring frequencies based on population served; Regulation 16 requires results to be reported to DWI; Regulation 19 requires notification of PCV breaches within 30 days; DWI Technical Guidance (TG01 to TG10 series) provides detailed guidance on monitoring methods and quality assurance.

    UKAS ISO/IEC 17025:2017 Accreditation for Regulatory Water Testing

    All laboratories carrying out analysis of regulatory water quality samples in the UK must hold UKAS accreditation for each relevant method; UKAS accreditation schedule is method-specific (identifies each analytical method, scope, and any limitations); UKAS conducts annual surveillance visits and 3-yearly reassessment; failure to maintain accreditation results in withdrawal of authority to report regulatory results to DWI or EA.

    Cryptosporidium (Additional Measures) Direction 1999 - Continuous Monitoring Obligation

    The Direction requires continuous monitoring for Cryptosporidium oocysts at all treatment works abstracting surface water or groundwater under the direct influence of surface water (GWUDI); monitoring must use a validated method (US EPA Method 1623.1 or BS EN 14764); results must be reported to DWI monthly; oocyst detections above defined trigger levels require immediate investigation and possible supply restriction.

    EA MCERTS (Monitoring Certification Scheme) for Environmental Water Quality Analysis

    EA MCERTS certification is required for laboratories and instruments used in analysis of environmental water samples for EA Environmental Permit compliance reporting; MCERTS covers drinking water treatment chemical analysis, effluent analysis, and continuous emission monitoring; MCERTS requirements include ISO 17025 accreditation plus additional EA-specific method and quality requirements; MCERTS certification is separate from and in addition to UKAS accreditation.