Water Quality

Drinking Water Well Testing

Drinking Water Well Testing

Complete the required annual testing for 2023

The California Rice Commission’s Waste Discharge Requirement (WDR) requires, beginning in 2022, each grower (or landowner) to conduct annual testing for nitrates in all drinking water supply wells present on parcels where rice is produced. The results are reported from the analytical laboratory to the State’s GeoTracker database.

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Drinking Water Well Testing

Drinking Water Well Testing

Complete the required annual testing for 2023

The California Rice Commission’s Waste Discharge Requirement (WDR) requires, beginning in 2022, each grower (or landowner) to conduct annual testing for nitrates in all drinking water supply wells present on parcels where rice is produced. The results are reported from the analytical laboratory to the State’s GeoTracker database.

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2023 Results – Pyrethroid TMDL Update 

2023 Results – Pyrethroid TMDL Update 

Pyrethroid and Water/Sediment Toxicity Results to Date 

The California Rice Commission collects data on pyrethroids and toxicity in water and sediments at our four main agricultural drain sites in accordance with the Basin Plan Amendment Total Maximum Daily Loads (TMDL) requirements under the Clean Water Act. Pyrethroids (i.e., Warrior, Lambda-cy, Silencer) are used in rice production to manage insects.

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2023 Results – Rice Pesticides Program 

2023 Results – Rice Pesticides Program 

Significant Thiobencarb Concentration Detections in Colusa Basin Drain

The Rice Pesticide Program (RPP) will enter the 8th week of thiobencarb (i.e., Bolero, Abolish, Willowood Thio) monitoring on June 27.  The results of monitoring across the sampling sites have generally yielded positive results with only two samples exceeding the performance goal of 1.5 μg/L to date.   

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2023 Water Quality Monitoring Start

2023 Water Quality Monitoring Start

Surface Water Monitoring Programs Begin Next Week on May 9th 

The Rice Pesticide Program (RPP) will begin next week on May 9th.  The RPP monitors for thiobencarb for 10 consecutive weeks at 4 agricultural drain sites (2 east and 2 west of the Sacramento River), and one site in the Sacramento River near downtown Sacramento and upstream of the drinking water intake facilities. 

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