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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Merphos


Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

Merphos is an organophosphorus compound used for pesticide manufacturing; millions of pounds are produced annually.

 
Detected
Found above
health guidelines
Found above
legal limit
States
1
-
-
Water utilities
1
-
-
People Served
300
-
-

Merphos Exposure by State

Water utilities in 1 states have reported detecting Merphos in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Merphos contamination
SystemsPopulation
California1300
Total1300

The Most Polluted Communities

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

Ranked by highest average Merphos level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Brock Mutual Water Company
Bakesrfield, CA
3001 of 12.15 ppb
(2.15 ppb)

Testing Summary for Merphos

Are tests routinely required for Merphos by federal law?No
Water suppliers reporting tests for Merphos (2004-2007):218 of 47,576
Average testing rate for water supplier reporting tests (2004-2007):0.3 per year