Water Quality

Water Quality •

Thiobencarb Monitoring Season Set to Start

Monitoring for 2020

Thiobencarb monitoring starts at all five sampling sites tomorrow, April 28. We base the monitoring on planting and timing of thiobencarb applications with several counties receiving notices of intent to apply Abolish. 

Monitoring typically takes place on Tuesdays and Thursdays except this year with the addition of Wednesday during certain weeks. We are on an assessment monitoring schedule with the Rice WDR, which expands sample collection beyond a Tuesday/Thursday program. The total thiobencarb monitoring will remain a ten-week schedule and include the same number of samples as previous years.

Changes to the REI and field posting

The thiobencarb restricted entry interval (REI) was decreased from 7-days to 12-hours. The change is reflected in a supplemental label, which must be present and available (in-hand) at time of application. Without the supplemental label, you are held to the 7-day REI and field posting requirements. You can receive the supplemental label from your Valent representative, thiobencarb suppliers or a link to the CRC pesticide update provided last week. 

For more information, contact the CRC’s Industry Affairs Manager Roberta Firoved at rfiroved@calrice.org or (916) 206-5039.

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Rice Water Quality Programs Monitoring Update
Water Quality •

Rice Water Quality Programs Monitoring Update

Monitoring for 2025 is halfway complete.

The 2025 surface water monitoring under the RPP and WDR programs is ongoing.

For the Rice Pesticide Program (RPP), there have been a handful of detections in late May, none of which were above the agricultural drain performance goal.  The latest results from early June were non-detectable.  

The Rice Waste Discharge Requirements (WDR) surface water program is in an assessment year, which means additional sampling for pesticides and toxicity.

Pyrethroids used in rice have been reported in association with water toxicity at the upper Colusa Basin Drain this year for multiple events.  The California Rice Commission (CRC) sent out letters earlier this year requesting the use reporting information (to be submitted in the fall) for pyrethroid users in the area.  Algal water toxicity was reported in the Sacramento Slough near Karnak as well.  

The CRC continues to work on behalf of the industry to conduct required monitoring and interface in reporting with the Water Board.  Additional efforts are underway to assess and analyze water quality trends across the valley and gather information from industry on uses and operational patterns.

We appreciate the industry’s support of the regulatory programs and their good stewardship of the commercial products used and protection of the environment.

For more information, contact the CRC’s Industry Affairs Manager Craig Riddle at criddle@calrice.org.

2025 Water Quality Monitoring Start
Water Quality •

2025 Water Quality Monitoring Start

Water Quality Is Our Collective Stewardship

The water quality monitoring under the Rice Pesticide Program (RPP) will begin on April 29th.  The RPP monitors for thiobencarb for 10 consecutive weeks at 4 agricultural drain sites and one site in the Sacramento River near downtown Sacramento.  

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