EWG's Tap Water Database — 2021 UPDATE


Perfluorooctanoic acid (PFOA)

Home Gardens County Water District

Perfluorooctanoic acid (PFOA) is a member of a group of perfluorinated chemicals used in many consumer products. PFOA and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20147.10 ppt204ND - 42.0 ppt
201713.1 ppt319ND - 110.0 ppt
201827.3 ppt11256ND - 200.0 ppt
201927.5 ppt10674ND - 230.0 ppt

ppt = parts per trillion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.007 ppt

The EWG Health Guideline of 0.007 ppt for PFOA was proposed by California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Proposed Maximum Contaminant
Level (MCL) 4 ppt

The proposed legal limit for PFOA is 4 ppt, based on studies on people, including children, showing cancer risk.

ppt = parts per trillion

All test results

Date Lab ID Result