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National Drinking Water Database

National Drinking Water Database - Chemical Contaminants


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

Acetaldehyde is a widely-used industrial chemical and common air pollutant; it is released into the environment from chemical manufacturing and from the combustion of fossil fuels.

Found above
health guidelines
Found above
legal limit
Water utilities
People Served

Acetaldhyde Exposure by State

Water utilities in 2 states have reported detecting Acetaldhyde in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Acetaldhyde contamination

The Most Polluted Communities

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

Ranked by highest average Acetaldhyde level

RankSystem Population Served Positive test results of total reported tests Average Level
1Valley County Water Dist.
Baldwin Park, CA
55,0002 of 23.55 ppb
(2.4 to 4.7 ppb)
2Wright City Wsc 1
Troup, TX
1,0501 of 12.2 ppb
(2.2 ppb)
3Patton Lake Club Inc
Splendora, TX
251 of 11.9 ppb
(1.9 ppb)
4City of Somerville
Somerville, TX
1,7041 of 11.5 ppb
(1.5 ppb)
5South Tahoe Pud - Main
South Lake Tahoe, CA
60,00010 of 151.41 ppb
(0 to 4 ppb)
6North Harris County Regional Water Autho
01 of 11.4 ppb
(1.4 ppb)
7Horseshoe Bend Village
Houston, TX
4951 of 11.3 ppb
(1.3 ppb)
8Inverness Point Water System
Austin, TX
3001 of 11.3 ppb
(1.3 ppb)
9Pleasure Point Wsc
Zavalla, TX
2161 of 11.3 ppb
(1.3 ppb)
10Northwest Harris County Mud 23
Spring, TX
3,2761 of 11.3 ppb
(1.3 ppb)

Testing Summary for Acetaldhyde

Are tests routinely required for Acetaldhyde by federal law?No
Water suppliers reporting tests for Acetaldhyde (2004-2009):19 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.3 per year