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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Hexazinone


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

Hexazinone is a broad-spectrum herbicide used to suppress the growth of grasses, weeds and some woody plants; it is a pervasive, highly water soluble groundwater contaminant.

 
Detected
Found above
health guidelines
Found above
legal limit
States
1
-
-
Water utilities
7
-
-
People Served
2,568
-
-

Hexazinone Exposure by State

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

StateWater Suppliers with Hexazinone contamination
SystemsPopulation
Maine72,568
Total72,568

The Most Polluted Communities

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

Ranked by highest average Hexazinone level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Hancock Heights Mhp
Hancock, ME
2182 of 23.75 ppb
(3.7 to 3.8 ppb)
2Crescent Mobile Home Park
Hancock, ME
702 of 22.9 ppb
(2.4 to 3.4 ppb)
3Allen Water Company
Columbia Falls, ME
681 of 10.96 ppb
(0.96 ppb)
4Machias Water Company
Machias, ME
1,3832 of 30.87 ppb
(0 to 1.3 ppb)
5Aqua Maine,inc. Union Division
Rockport, ME
2381 of 10.69 ppb
(0.69 ppb)
6Addison Point Water District
Addison, ME
1631 of 20.35 ppb
(0 to 0.69 ppb)
7Franklin Water Dept.
Franklin, ME
4284 of 50.21 ppb
(0 to 0.42 ppb)

Health Based Limits for Hexazinone

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.400 ppb
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.400 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.2000 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.2000 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.3000 ppb

Testing Summary for Hexazinone

Are tests routinely required for Hexazinone by federal law?No
Water suppliers reporting tests for Hexazinone (2004-2009):239 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.2 per year