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National Drinking Water Database


Prometryn in California


Prometryn is an herbicide applied to various food and feed crops, primarily cotton and celery; it has been detected in groundwater in agricultural areas in California.

The Most Polluted Communities in California

1 water utilities reported detecting Prometryn in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Prometryn level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Rancho California Water District
Temecula, CA
103,4141 of 370.06 ppb
(0 to 2.3 ppb)

Health Based Limits for Prometryn

StandardDescriptionLevel
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.300 ppb

Violation Summary for Prometryn in California

There are no violations reported for this contaminant in California