Reuse, Recovery & Stormwater
Agricultural Water Reuse Companies
Treatment for fit-for-purpose irrigation water, pathogen, salinity, and nutrient management tuned to crop and soil needs.
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Designing Treated Wastewater Reuse Systems for Agricultural Irrigation
Agricultural water reuse takes treated municipal or industrial wastewater and delivers it to crops, pasture, or landscape via spray, drip, or surface irrigation. Treatment requirements tie to crop type and contact: food crops eaten raw require Title 22 California or EU Regulation 2020/741 Class A standards (≤10 CFU/100 mL E. coli, ≤5 NTU turbidity, ≤10 mg/L BOD), while non-food crops accept Class B–D with looser microbial limits. Treatment trains typically combine secondary biological treatment, filtration (sand or membrane), and disinfection (UV at 100 mJ/cm² or chlorine to ≥1 mg/L residual after 30 min CT).
Beyond pathogen control, agricultural reuse must manage salinity (target EC <2 dS/m for most field crops, <0.7 for sensitive crops), sodium adsorption ratio (SAR <10), and trace nutrients (residual nitrogen at 5–20 mg/L offsets fertilizer demand by 30–60%). Heavy metals must meet US EPA 503 biosolids land-application limits or EU equivalents. Drip irrigation infrastructure is preferred for Class A reuse because it eliminates aerosol exposure and reduces evaporative loss by 30–50% versus sprinklers.
Regulatory and economic drivers include EU Reg 2020/741 binding since June 2023, California Water Code §13550, and Israel's Mekorot model where over 85% of municipal wastewater is reused agriculturally. Tariff models range from utility-supplied at $0.20–0.80/m³ subsidized to incentivize uptake, to dedicated reuse contracts with industrial generators. Aguato lists providers with proven design-build-operate track records across MBR + UV, conventional + chlorination, and storage-reservoir-based reuse systems.
Frequently Asked Questions
What treatment level does EU Regulation 2020/741 require for agricultural reuse?
Class A (food crops eaten raw, all irrigation methods) requires ≤10 CFU/100 mL E. coli, ≤10 mg/L BOD, ≤10 mg/L TSS, ≤5 NTU turbidity, and Legionella <1,000 CFU/L. Class B (food crops processed, pasture) allows 100 CFU/100 mL E. coli. Class C and D apply to non-food crops with progressively looser limits. Class A trains typically combine secondary + tertiary filtration + UV or chlorine disinfection plus continuous turbidity monitoring.
How does salinity in reuse water affect crop yield?
Salinity measured as EC or TDS reduces crop yield above species-specific thresholds. Beans, carrots, and strawberries tolerate EC up to 1 dS/m before yield loss begins; tomatoes, wheat, and cotton tolerate 2.5–7 dS/m. Sodium adsorption ratio above 10 degrades soil structure regardless of EC. Treatment-stage adjustments — partial RO blending, calcium addition for SAR control — are common interventions in chronic-salinity sites.
Does reused wastewater have agronomic value beyond water supply?
Yes — residual nitrogen at 5–20 mg/L after secondary treatment, phosphorus at 1–5 mg/L, and potassium at 10–25 mg/L can offset 30–60% of crop fertilizer demand. Reuse providers and farmers increasingly account for this through fertigation budgeting, reducing chemical fertilizer purchases. Soil monitoring is required to avoid over-application of nitrogen on nitrate-vulnerable groundwater zones.
What is the typical cost per cubic meter for agricultural reuse water?
Reuse water tariffs are typically GBP 0.10 to GBP 0.50 per m3 for utility-supplied agricultural use, below potable water pricing and competitive with abstraction licence costs in drought-stressed regions. Capital cost for the tertiary treatment uplift over secondary effluent runs GBP 0.08 to GBP 0.25 per m3 on a 20-year amortisation. Water company and EA-negotiated reuse schemes in England are increasingly structured under multi-party water recycling agreements that distribute treatment cost between the WaSC and the agricultural off-taker.
A cluster of vegetable producers in a drought-designated groundwater catchment were abstracting 12,000 m3 per year from a chalk aquifer under a licence scheduled for reduction by 40% under the Environment Agency's Restoring Sustainable Abstraction programme. The local water company's water recycling centre was discharging 3,500 m3/day of secondary effluent to the receiving river.
A water reuse scheme was developed under a tripartite agreement between the farming cooperative, the water company, and the Environment Agency. Tertiary treatment was added to the water recycling centre comprising disc filtration and UV disinfection to achieve EA Class A+ reuse standard. A dedicated 2.5 km pipeline delivered reuse water to a seasonal storage lagoon for drip irrigation supply.
The cooperative received 2,800 m3/day of reuse water at no charge during the irrigation season (April to September) in exchange for the water company's obligation to provide tertiary treatment. Groundwater abstraction was reduced by 55%, exceeding the EA's RSA target. The water company avoided a GBP 1.8 million environmental upgrade to the receiving river consent, making the reuse scheme economically favourable for all parties.
Questions to Ask Shortlisted Providers
- 1
What microbiological treatment standard does your system achieve, and has it been validated against the EA or DWI reuse quality framework for the specific crop types in our scheme?
UK agricultural water reuse does not yet have a single consolidated regulation; the treatment standard must be negotiated with the EA and validated against pathogen risk assessment for each crop type and irrigation method.
- 2
What is the residual nitrogen, phosphorus, and potassium concentration in the treated reuse water, and have you modelled the fertigation credit against standard fertiliser application rates?
Nutrient credit can represent GBP 30 to GBP 100 per hectare per year in displaced fertiliser cost; quantifying this offsets the perception that reuse water is purely a cost item.
- 3
How does the treatment system maintain compliance during the winter maintenance period when the treatment works may be operating at reduced load or undergoing planned shutdown?
Agricultural reuse storage must be sized to bridge supply interruptions; the storage volume requirement is directly linked to the treatment system's reliability and maintenance schedule.
- 4
What monitoring and sampling protocol do you propose to satisfy the Environment Agency's reuse quality verification requirements, and who bears the cost of compliance monitoring?
EA reuse consents typically require regular microbiological sampling at the point of use; the monitoring obligation and its cost must be explicitly assigned in the reuse agreement.
- 5
How does salinity in the effluent compare with the EC thresholds for the specific crops in our rotation, and is there a risk of soil sodicity from the SAR in the reuse water?
Chronic irrigation with unsuitable salinity or SAR damages soil structure and reduces crop yield over time; this risk must be assessed against actual effluent chemistry before the scheme is committed.
What Drives Cost in This Category
Upgrading from secondary-only effluent to Class A reuse quality through tertiary filtration, UV, and monitoring infrastructure can cost GBP 500,000 to GBP 3,000,000 depending on the flow rate and existing works layout.
Pipeline length and topography between the water recycling centre and the irrigation zone often represent the largest single capital cost in a reuse scheme, particularly in rural settings where pipe routes cross multiple land ownerships.
Irrigation demand is seasonal but treatment works discharge is year-round; storage lagoons or tanks to buffer the mismatch add civil cost that scales with the storage volume required.
Regular microbiological sampling at point of use, flow metering, and annual agronomic soil assessments are typically required by the EA as permit conditions, adding ongoing operational cost to the scheme.
Key Regulations & Standards
The EA's position statement on water recycling from water recycling centres sets out the risk assessment and treatment quality requirements for agricultural reuse schemes in England.
Requires environmental flow objectives to be met for receiving water bodies, which in drought-stressed catchments increasingly requires abstraction reduction that agricultural reuse schemes can help deliver.
Agricultural application of nitrogen-containing reuse water in designated NVZs must comply with nitrogen loading limits, requiring nutrient accounting for the residual nitrogen content of the reuse water.
The Water Industry National Environment Programme requires water companies to reduce environmental impact of their discharges, creating incentives to develop water reuse schemes that reduce effluent volume discharged to sensitive receiving waters.