STWEC: (530) 527-4208


Watershed Education Coalition

​​​​PO BOX 933 RED BLUFF, CA 96080


​What is the ILRP?

Check out this great and brief (5:05 min.)
 ILRP introductory video produced by the  Central Valley Regional Water Quality Control Board (Regional Water Board) as part of the Annual Report to the Regional Water Quality Control Board.   
Irrigated Lands Regulatory Program (ILRP) 
​All commercial irrigated lands, including nurseries and managed wetlands, are required to have regulatory coverage. Options for regulatory coverage include joining a coalition group, such as STWEC to obtain coverage as an individual grower under general WDRs, or obtaining an Individual Permit. The coalition groups work directly with their member growers to assist in complying with requirements by conducting monitoring and preparing regional plans to address water quality problems. See About for more STWEC information.

Water Quality Sampling 

The Sacramento Valley Water Quality Coalition (STWEC's umbrella organization) conducted water quality samples as required by the Irrigated Lands Conditional Waiver and the SVWQC’s Monitoring and Reporting Program (MRP). The observed exceedances of the ILRP Trigger Limits and planned follow-up actions summaries are provided below:
Water Quality Sampling Summary- Event Dates: 
July 23, 2020
Water Quality Sampling Summary - Event Dates: 
Nov 24,2018 - Sept 26, 2019
Water Quality Sampling Summary - Event Dates:
 July 21 – 23, 2015
Water Quality Sampling Summary - Event Dates: 
June 16 – 18, 2015
Legal Requirement to Submit Farm Evaluation
The Central Valley Regional Water Quality Control Board recently addressed a notification letter to all third-party subwatershed coalition members, including STWEC, who have yet to submit the Farm Evaluation for Waste Discharge Requirement (Order) compliance. All STWEC members have a legal requirement described in the Order to complete and submit the Farm Evaluation and Notice of Confirmation. For a complete list, see the Member Rqmts tab.
Farm Evaluation Summary - Sacramento Valley 
As outlined in the Waste Discharge Requirements General Order for Growers within the Sacramento River Watershed (WDR or General Order; Order No. R5-2014-0030), the Sacramento Valley Water Quality Coalition (SVWQC or Coalition) is submitting a summary of management practice information obtained from Farm Evaluations (FEs).  All members, including STWEC members, were required to complete and return surveys for enrolled parcels to STWEC by March 1, 2015. This
 Farm Evaluation Summary reports management practices implemented by members throughout the Sacramento Valley during the 2014 calendar year for standard Farm Evaluations.
Waste Discharge Requirement (WDR) Adopted - March 2014
On March 12, 2014 the Central Valley Regional Water Quality Control Board (Regional Water Board) adopted new requirements for irrigated lands in the Sacramento Valley. 
The requirements, known as a Waste Discharge Requirements (WDR) Order (R5-2014-0030) are the culmination of nearly two years of negotiation between STWEC and Sacramento Valley Water Quality Coalition (SVWQC) co-leadership and Regional Water Board staff. For more Irrigated Lands Regulatory Program (ILRP) information pertaining to the WDR please visit

WDR Order Comment Letter Responses  
During the winter of 2013/14, the Regional Water Board provided an opportunity for the public to submit written comments on the tentative Waste Discharge Requirements for Growers within the Sacramento River Watershed. On behalf of STWEC and neighboring north valley watershed coalitions, the Sacramento Valley Water Quality Coalition submitted one of the nine (9) comment letters. Petitions on Eastern San Joaquin River Watershed Agricultural Order 

2013 Annual Monitoring Report
As mandated by the Water Board's ILRP WDR Order, water quality sampling was conducted and compiled into the 
2013 Annual Monitoring Report. The report provides a detailed description of monitoring results conducted throughout the Sacramento River Basin. Findings within the STWEC region are included in this report; see pages 15, 27, 45, and Appendix D/Exceedances.