Monitoring & Digital

    Industrial Water Quality Testing Companies

    Accredited labs and on-site testing services for process water, effluent, and regulatory compliance monitoring.

    147 providers

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    Siltbuster Group logo

    Siltbuster Group

    United Kingdom

    Established for over 20 years, the Siltbuster Limited provides rapidly deployable, “modular off the shelf” water treatment solutions to the construction, industrial and municipal markets, with a client base ranging from the world’s most recognisable multi-national corporations to small enterprises. Siltbuster provides a wide range of water and wastewater treatment equipment for the industrial and municipal markets, including: Packaged lamella dissolved air flotation (DAF) units. Lamella clarifiers. Packaged biological treatment systems. Oil/water separators. Pipe flocculators. Reaction tanks. Containerised dosing systems. In the UK, Siltbuster has pioneered the concept of offering this plant through our extensive hire fleet. Approximately 20 major contracts and circa 50 smaller projects are undertaken each year for a diverse range of clients, many of which are some of the UK’s best-known companies. In addition to the industrial/municipal sector, Siltbuster has undertaken a number of mine water treatment projects in many countries, for example, the UK, Ireland, Greece, France, USA, Canada, Australia and Slovakia. The Siltbuster team pride themselves in their ability to react rapidly and in compliance with the project constraints, delivering mobile or permanent solutions tailored to meet your individual needs.

    Treatment Process Technologies
    Asset Maintenance & Rehabilitation
    Stonbury logo

    Stonbury

    United Kingdom

    Stonbury is an agile, direct delivery specialist contractor to both the water industry and wider water environment, with an emphasis on delivering innovative, low carbon and high-quality reliable solutions. Currently holding over 30 Frameworks, we work with most of the UK’s water companies and the EA – either directly or through their major supply chains – to deliver high value, low carbon solutions across their asset estates. This includes works on potable water, wastewater treatment centres and nature-based ‘green’ and ‘grey’ solutions that deliver smart, low carbon environmental engineering. In recognition of the intensified global focus on the effects of carbon emissions and their impact on the climate and biodiversity we have reassessed our Purpose, Vision and Strategic Goals, putting sustainability at the heart of our culture and everything we do.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Veolia Water Technologies UK logo

    Veolia Water Technologies UK

    United Kingdom

    Veolia Water Technologies (VWT) provides an unrivalled combination of capabilities in the UK for the treatment of water, wastewater, sludge and odour. VWT provide turnkey solutions from feasibility studies, design and build and supply and installation of packaged treatment solutions, through to the extension or refurbishment of existing water and wastewater facilities. The company’s investment in Research & Development focuses on developing the most innovative solutions for its municipal and industrial clients, while at the same time considering the environmental challenges being faced. VWT’s goal is to develop sustainable and technologically superior solutions that balance the demand for efficient and cost effective technology whilst protecting the environment by looking at energy consumption, carbon emissions, odour pollution and safe guarding water quality. With over 125 years of experience in the UK, VWT is able to draw upon an unsurpassed knowledge of traditional and innovative solutions in order to meet the demands of both industrial and municipal clients. Performance is measured by the global satisfaction of VWT’s customers. Their technical creativity is reflected by a prestigious track record of extensive references in the UK and across the world supported by operational experience. A partnership with VWT provides the unique benefits of technical excellence, innovation, reliability and a trusted partnership. VWT offers a range of proprietary technology for applications to treat Drinking Water, Wastewater, Sludge Treatment, Odour Treatment and Industrial Effluents.

    Treatment Works Products/Services
    Asset Maintenance & Rehabilitation
    Water Engineering Services Ltd logo

    Water Engineering Services Ltd

    United Kingdom

    Water Engineering Services Ltd is tailored to provide a full turnkey solution to fulfil clients’ needs.   The team brings extensive knowledge of working within the wider water industry and other similar industries e.g. commercial, industrial, petrochemical and pharmaceutical. We recognise the benefits and challenges incorporating innovation into a project noting innovation can be new technology or working methodology. With our experiences working outside the Water Industry and with a wide range of Delivery Partners, WES Ltd look to bring innovation and best practices into all their projects to ensure the best project completion is achieved for all parties. WES Ltd considers Design for Manufacture and Assembly (DfMA) methodologies during the Design phase on all projects and having the Fabrication arm of the business allows for DfMA concepts to be realised, as well as providing bespoke solutions for end clients or other suppliers. Water Engineering Services consists of 3 in house areas of business: DESIGN: Our in-house design department specialises in mechanical & electrical designs but has very strong ties with Delivery Partners to also offer structural, civil, hydraulic and system integration. Our design team cover all aspects of a project from feasibility studies and optioneering to fabrication and construction drawings. ON-SITE INSTALLATION & COMMISSIONING: Our WES Ltd installation team, constructs, commissions, and optimises a project regardless of scale and complexity. This is achieved by utilising the experienced in-house mechanical & electrical team or managing a Delivery Partner or specialist contractor. Our Project Managers, Site Managers/ Supervisors, Design and CAD Engineers, Commissioning Engineers, Electrical and mechanical Site operatives all have up to date industry competency training and certification. All our electrical work will be fully tested CompEX and NICEIC certified. FABRICATION: With our 15,000 square foot workshop, offering stainless and mild steel fabrication to BSEN 1090 Execution class 2 and WRAS approval. ACCREDITATIONS WES Ltd is accredited with: ISO 9001 (Quality Management Systems) 14001 (Environmental Management Systems) 45001 (Occupational Health and Safety Management Systems) EN 1090 Ex Class 2 SafeContractor SafePQQ-PAS91 CHAS CHAS Advanced-PAS91 Achilles UVDB Silver + ISO 26000 (working towards) WES Ltd internal systems also conform to ISO 19650 (Information Management – BIM) and allow for integration into a client’s internal system e.g., ProjectWise.

    Networks - Water Supply
    Contractors
    Waterco logo

    Waterco

    United Kingdom

    Waterco are engineering and environmental consultants providing design and consultancy services relating to water, drainage and flood risk. We have expertise in engineering and environmental disciplines and are supplemented by a network of specialist independent consultants with extensive experience in major development projects throughout the UK. Our focus is on achieving the optimum solution for our clients, meeting their objectives and adding value to their projects. We have gained a reputation for a friendly, professional and flexible approach since our establishment in 1990. Our Services Water industry infrastructure and non-infrastructure projects Pipelines & Sewerage Water & Wastewater Treatment & Systems Pumping Stations Contingency Planning Security Assessments Asset Management Surge Analysis Hydraulic Modelling Flood Risk Assessment Breach Analysis Coastal & Shoreline Analysis Surface Water Management Sustainable Drainage Systems Natural Flood Management/Catchment Approaches Clients and Partners Our clients and partners include water companies, consultants and contractors. Incorporating their experience and knowledge, we investigate and develop practical designs, to help deliver cost-effective solutions. Geographic Coverage We undertake projects all across the UK, with many of our reporting services being desk-based, travelling to site visits and meetings as required. We have also been involved in international projects such as a major development in Lekki, Nigeria. Accreditations We currently have an ISO 9001 : 2015 accredited Quality Management System; have a BS8555 : 2003 certified Environmental Management System; have design approval in the Water Industry Registration Scheme (WIRS); have maintained Investors in People recognition since 2011 and operate an ICE approved training scheme.

    Designers
    Western Carbons Ltd logo

    Western Carbons Ltd

    United Kingdom

    Western Carbons is the leading producer of anthracite filter media in the UK. All our products are produced and certificated to the DIN and European standards and our quality control is audited to ISO 9001:2000. As a company we provide a total filter servicing package which includes: Filter investigations Filter media testing Filter media supply and installation Filter refurbishments, RGF’s, slow sand filters and pressure filters Monolithic floor design and construction Filter media washing Wastewater filter refurbishment Western Carbons have developed an in-house filter media pumping system which provides a clean, quick and economical method of filter media installation. If required, we can recycle the water used for the installation of the filter media. By eliminating, in many cases, the need to transport the media in bulk plastic bags we provide a means of actually reducing our carbon footprint, not just saying that this is our intent.

    Treatment Process Technologies

    Industrial Water Quality Testing: Parameter Selection, Sampling Protocols, and Accreditation Requirements

    Industrial water quality testing covers source water, process water, cooling water, boiler feedwater, and effluent streams. Parameter selection follows the intended use: boiler feedwater requires hardness below 0.05 mg per L CaCO3, silica below 0.02 mg per L, iron below 0.01 mg per L, and dissolved oxygen below 0.007 mg per L per ASME consensus on operating practices for boiler feedwater; cooling water monitoring tracks conductivity (TDS proxy), pH, Langelier Saturation Index, Legionella (monthly culture per HSG274), and oxidising biocide residual. Effluent monitoring for regulatory compliance requires parameters specified in discharge consent: typically pH, BOD, SS, COD, ammonia, specific pollutants.

    Sampling protocols follow ISO 5667 series: representative sampling from well-mixed flow locations, avoidance of air entrainment, appropriate sample containers (borosilicate glass or HDPE depending on analyte), preservation (acidification to pH below 2 for metals, cooling to 4 degrees C for biological parameters, immediate fixation for dissolved oxygen), and maximum holding times before analysis (metals 6 months acidified, COD 7 days cooled, microbial parameters 6 to 24 hours). Composite sampling (24-hour flow-proportional composite) provides representative daily loads for effluent reporting; grab samples capture worst-case instantaneous concentrations for regulatory compliance checks.

    Laboratory accreditation to ISO 17025 is required for regulatory compliance sampling (Environment Agency consent conditions in UK specify UKAS-accredited analysis; US EPA specifies certified laboratory analysis for NPDES permit compliance). On-site testing using portable analysers (multi-parameter meters for pH, conductivity, turbidity, DO; photometric test kits for ammonia, nitrate, phosphate) provides real-time process control at lower cost than laboratory analysis. Online continuous monitoring instruments (ion-selective electrodes, optical turbidimeters, TOC analysers) provide trend data and alarm triggering for process exceedances. Combined accredited laboratory plus online monitoring gives both regulatory defensibility and process optimisation capability.

    Frequently Asked Questions

    What water quality tests are required for industrial discharge permits?

    NPDES and Environment Agency discharge consents specify the parameters, frequency, and method for compliance monitoring. Common required parameters: pH (continuous or daily), BOD5 (weekly), suspended solids (weekly), COD (weekly or monthly), ammonia (weekly), and sector-specific parameters (metals, hydrocarbons, cyanide, chlorine for relevant industries). US EPA 40 CFR Part 136 specifies approved analytical methods for NPDES compliance; UK Environment Agency Technical Guidance specifies appropriate British Standards (BS EN ISO series) methods. Analysis must be performed by a certified/accredited laboratory (UKAS in UK, state-certified in US). Self-monitoring results must be reported on Discharge Monitoring Reports (DMRs in US) or equivalent regulatory submissions within specified timescales (typically monthly).

    How often should cooling water be tested for Legionella?

    UK HSE ACOP L8 and HSG274 Part 1 require cooling tower water to be tested for Legionella by culture at minimum monthly intervals. Action limit is 1,000 CFU per L of Legionella (any species) requiring immediate corrective action and notification to the Responsible Person. Investigation level at 100 to 999 CFU per L triggers review of control measures. Target is below 100 CFU per L (ideally below the detection limit of 10 CFU per L). Quantitative PCR (qPCR) methods provide results in 24 to 48 hours versus 10 to 14 days for culture, enabling faster response to exceedances. HACCP-based risk assessments determine if additional testing (e.g., weekly during high-risk periods, after system disruption, after maintenance) is required beyond the statutory monthly minimum.

    What is the difference between grab sampling and composite sampling?

    A grab sample is a single sample collected at a specific moment, representing instantaneous water quality conditions. Used for parameters that change rapidly (pH, dissolved oxygen, volatile compounds) or where instantaneous worst-case is the regulatory requirement. A composite sample is collected over time (typically 24 hours) either at fixed time intervals (time-composite) or in proportion to flow rate (flow-proportional composite). Flow-proportional compositing requires an autosampler triggered by a flow meter signal, collecting a volume of sample proportional to the instantaneous flow rate. This produces a sample representative of the average quality over the sampling period, appropriate for load calculations and daily average compliance monitoring. Most NPDES and EA discharge permits specify the sampling method; effluent consents often require both grab (for pH) and composite (for BOD, SS) within the same monitoring programme.

    How do I choose between on-site testing and laboratory analysis?

    On-site testing using portable or online instruments: fast results (minutes), suitable for process control and trend monitoring, lower cost per test but requires calibration, QC, and trained operators. Accuracy: pH meters plus or minus 0.02 pH units, turbidimeters plus or minus 2 percent, DO sensors plus or minus 0.1 mg per L. Not acceptable for regulatory compliance (not UKAS/ISO 17025 accredited). Laboratory analysis by UKAS-accredited laboratory: traceable methods, method blanks, certified reference standards, proficiency testing scheme participation (EMQN, WEQAS for environmental). Required for: discharge consent compliance, environmental permit reporting, legal proceedings, and due diligence. Typical turnaround: 5 to 10 working days standard, 24 to 48 hours emergency. Best practice: continuous online monitoring for process control, monthly UKAS laboratory analysis for regulatory compliance.

    Case Study·Chemical manufacturing
    Challenge

    A specialty chemical site in the South East of England had no consolidated water quality monitoring programme. Cooling water, boiler feedwater, and trade effluent were all managed by different operational teams using different contractors and non-standardised sampling protocols. Three Environmental Permit non-compliances occurred in one year due to incorrect sampling method and laboratory reporting errors.

    Approach

    Appointed a single UKAS-accredited laboratory to cover all monitoring obligations under a unified contract. Developed a sampling and analysis plan aligned with ISO 5667 and the site's Environmental Permit conditions. Installed online TOC and pH monitors on the effluent channel for early-warning alerting before discharge. Trained site operators in sampling protocols with documented procedures and chain-of-custody forms.

    Outcome

    Zero Environmental Permit exceedances in the 24 months following the programme. Online monitoring detected two process upsets that would have caused consent breaches, enabling diversion to a holding tank before discharge. Annual monitoring cost reduced by 18 percent through consolidation, and Environment Agency satisfaction score improved at the next compliance inspection, avoiding enhanced scrutiny.

    Questions to Ask Shortlisted Providers

    1. 1

      Is your laboratory UKAS-accredited to ISO 17025 for the specific parameters included in our discharge consent, and can you provide a copy of your current UKAS scope?

      Environment Agency consent conditions in England and Wales require that compliance monitoring is conducted by a laboratory with UKAS accreditation for the relevant parameters and methods. A non-accredited result is not legally defensible and will not be accepted by the EA as evidence of compliance. UKAS scopes are specific to parameters and matrices; verify that the scope covers your actual consent parameters.

    2. 2

      What is your turnaround time for routine and emergency analysis, and what is your hold-time and preservation protocol for each parameter?

      Many parameters have strict maximum hold times between collection and analysis (microbial parameters 6 to 24 hours, volatile organics 7 days, BOD 6 hours unfixed). Inadequate preservation or delayed analysis can produce results that under-report contamination (biological degradation) or over-report it (chemical oxidation). Ask to see the laboratory's sample receipt and hold-time management procedures.

    3. 3

      What quality control data do you include in the analytical report, and what is your policy for reporting and flagging out-of-range results?

      ISO 17025 requires laboratories to report method blanks, certified reference standards, duplicate analyses, and recoveries alongside sample results. A report that simply lists numbers without QC data gives no confidence in result accuracy. If a QC check fails (e.g. spike recovery outside 80 to 120 percent), the sample results are potentially invalid and the laboratory should notify you and offer re-analysis.

    4. 4

      For online monitoring instruments, what is the calibration frequency and the method for validating online results against laboratory analysis?

      Online instruments (pH, turbidity, TOC, COD correlations) drift over time and require regular calibration against certified standards. A calibration log and a defined schedule for cross-validation against laboratory analysis (typically monthly) are required to use online data as evidence in operational decisions or in EA reporting. Instruments that have not been validated against laboratory methods have unknown bias and should not be relied upon for compliance decisions.

    5. 5

      Can you provide proficiency testing scheme participation records for the parameters in our monitoring programme?

      UKAS-accredited laboratories must participate in proficiency testing (PT) schemes such as EMQN or Environment Agency CONTEST rounds, where blind samples of known concentration are analysed and results compared against peer laboratories. PT Z-scores within plus or minus 2 indicate satisfactory performance. Request PT records for the last 12 months for your specific parameters; a laboratory with repeated Z-scores outside plus or minus 2 has a systematic analytical problem.

    What Drives Cost in This Category

    Monitoring programme scope and frequency

    A basic trade effluent consent monitoring programme (weekly pH, BOD, SS, COD for one discharge point) costs 5,000 to 15,000 GBP per year in laboratory analysis. Adding Legionella monthly culture for 3 cooling towers adds 8,000 to 15,000 GBP per year. Full Environmental Permit monitoring with quarterly metals, annual priority substances, and continuous online COD and pH monitoring (instrument maintenance and calibration) typically costs 25,000 to 80,000 GBP per year for a mid-sized industrial site.

    UKAS-accredited versus non-accredited analysis

    UKAS-accredited analysis typically costs 15 to 30 percent more than equivalent non-accredited analysis. However, non-accredited results are not accepted for regulatory compliance reporting in the UK, and a permit non-compliance attributed to inadequate analysis methods can result in prosecution costs, remediation requirements, and permit review of indefinite duration, vastly exceeding the cost differential.

    Online monitoring capital and maintenance

    Installing online COD, TOC, and pH monitors on an effluent channel costs 15,000 to 50,000 GBP per instrument point (instrument, housing, flow cell, SCADA integration). Annual maintenance and calibration costs 3,000 to 8,000 GBP per instrument. The business case for online monitoring is typically a combination of early-warning value (avoiding a single permit breach worth 20,000 to 100,000 GBP in surcharges and enforcement costs) and operational optimisation (reducing chemical dosing cost).

    Non-compliance costs and enforcement action

    An Environment Agency enforcement notice following permit non-compliance requires submission of a remediation plan, independent audit, and enhanced monitoring at increased frequency for 6 to 12 months. Total cost (legal, audit, additional monitoring, EA officer time at hourly rate) typically runs 30,000 to 120,000 GBP for a first-time non-compliance. A prosecution for repeated non-compliance can result in fines of 100,000 to 1,000,000 GBP plus remediation orders.

    Key Regulations & Standards

    ISO 17025:2017 -- Laboratory Competence and UKAS Accreditation

    ISO/IEC 17025:2017 is the international standard for the competence of testing and calibration laboratories. UKAS (United Kingdom Accreditation Service) accredits UK laboratories to ISO 17025. Environment Agency permit conditions for monitoring of trade effluent and environmental permit compliance require analysis by a UKAS-accredited laboratory using approved methods (typically BS EN ISO series methods). UKAS accreditation scope specifies the exact parameters, matrices, and methods covered; laboratories must be accredited for the specific combination relevant to each consent.

    ISO 5667 Series -- Water Sampling Protocols

    ISO 5667 is the definitive international series for water sampling. Key parts: ISO 5667-1 (general sampling programme guidance), ISO 5667-3 (preservation and handling), ISO 5667-10 (industrial and process water sampling), and ISO 5667-14 (quality assurance for environmental water sampling). UK Environment Agency technical guidance references ISO 5667 for sampling protocol requirements. Non-compliance with ISO 5667 hold times or preservation requirements renders sample results inadmissible for permit compliance purposes.

    Water Industry Act 1991 -- Trade Effluent Monitoring and Reporting

    Trade effluent consent conditions issued under WIA 1991 Section 118 specify monitoring parameters, frequency, analytical methods, and reporting requirements. Self-monitoring data must be submitted to the sewerage undertaker at specified intervals (typically monthly). Falsification of monitoring data is an offence under the Fraud Act 2006 in addition to the WIA 1991 offence. Water companies have the right of inspection and may require a metered flow totaliser to verify reported discharge volumes.

    Environment Agency Technical Guidance -- Compliance Classification Scheme

    The Environment Agency's Compliance Classification Scheme (CCS) grades Industrial sites' compliance performance by frequency and severity of non-compliances. Sites graded Red (significant non-compliance) face enhanced regulatory scrutiny, more frequent inspections, and potential permit review or revocation. Yellow (low-level non-compliance) sites may face improvement plans. Green sites maintain standard regulatory oversight. A strong monitoring and reporting programme is the primary mechanism for maintaining Green status and demonstrating due diligence.