Waste Discharge Requirements
The Central Valley Water Board has adopted waste discharge requirements (WDRs) for discharges from irrigated lands to protect both surface and groundwater. The Irrigated Lands Regulatory Program (ILRP) regulates such discharges within the jurisdiction of the Central Valley Water Board.
- What are Grower requirements under the WDR?
- The Farm Evaluation and Nitrogen Management Plan are submitted to the CRC every 5 years. The next reporting year is anticipated to be 2029.
- Nitrate monitoring in Drinking Water Wells onrice parcels began in 2022. Growers arrange for or collect samples from wellhead and submit to laboratory. The laboratory reports results to Grower andCentral Valley Board. Do not sample irrigation only wells. For sampling frequency: If N < 8 mg/L for3 consecutive years, then reduce sampling to every 5 years; If 8 < N < 10mg/L, continue annual sampling; If N > 10 mg/L, notify users and WaterBoard, stop sampling
- The CRC is compliant with the Salt and NitrateControl Program by participating in the Central Valley Salinity Alternativesfor Long-Term Sustainability (CV-SALTS) P&O Study-Phase 1, and the WaterBoard approved Nitrate Initial Assessment for Rice.
- The CRC has a Surface Water Quality ManagementPlan for Pyrethroids for rice acres that drain to the monitoring locations at upper Colusa Basin Drain (CBD5) and the Sacramento Slough near Karnak (SSB).Part of the Plan’s Implementation Report requires Growers within these two sub-watersheds to report to the CRC on their pyrethroid use and management practices.