The Power of Information

National Drinking Water Database

Atrazine in Maryland

Atrazine is an endocrine-disrupting herbicide used on corn, sugarcane and sorghum; it is associated with adverse reproductive effects and toxicity to the immune system. [read more]

The Most Polluted Communities in Maryland

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

Ranked by highest average Atrazine level

RankSystem Population Served Positive test results of total reported tests Average Level
1City of Frederick
Frederick, MD
54,0009 of 140.22 ppb
(0 to 0.93 ppb)
2Fort Detrick
Frederick, MD
7,5002 of 130.12 ppb
(0 to 0.9 ppb)
3Lake Linganore
Frederick, MD
13,6562 of 30.1 ppb
(0 to 0.2 ppb)
4City of Rockville
Rockville, MD
46,5003 of 100.1 ppb
(0 to 0.48 ppb)
5Freedom District
Westminster, MD
24,8701 of 30.07 ppb
(0 to 0.21 ppb)
6Town of Hampstead
Hampstead, MD
6,0625 of 140.06 ppb
(0 to 0.24 ppb)
7Luke / Newpage Luke Mill
Luke, MD
1843 of 110.05 ppb
(0 to 0.2 ppb)
8Maryland American Water Company
Bel Air, MD
13,2002 of 110.05 ppb
(0 to 0.4 ppb)
9New Design
Frederick, MD
40,5611 of 120.03 ppb
(0 to 0.3 ppb)
10City of Brunswick
Brunswick, MD
6,3942 of 130.02 ppb
(0 to 0.13 ppb)

Health Based Limits for Atrazine

California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.0.15 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.3 ppb
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.3 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.700 ppb

Violation Summary for Atrazine in Maryland

There are no violations reported for this contaminant in Maryland