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National Drinking Water Database


Formaldehyde in California


Formaldehyde is a chemical found in plastics, resins used for rug and fabric coatings and adhesives for particle board; it is an air pollutant and probable human carcinogen and may form as a byproduct of tap water disinfection. [read more]

The Most Polluted Communities in California

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

Ranked by highest average Formaldehyde level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1South Tahoe Pud - Main
South Lake Tahoe, CA
60,00011 of 1612657.06 ppb
(0 to 48000 ppb)
2Valley County Water Dist.
Baldwin Park, CA
55,0002 of 27007 ppb
(14 to 14000 ppb)
3San Gabriel Valley Water Co.-El Monte
El Monte, CA
153,6579 of 115.64 ppb
(0 to 10 ppb)

Health Based Limits for Formaldehyde

StandardDescriptionLevel
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.5000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.7000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.10000 ppb

Violation Summary for Formaldehyde in California

There are no violations reported for this contaminant in California