The Power of Information

National Drinking Water Database


Metolachlor in Maryland


Metolachlor is an herbicide applied on corn, soybeans, peanuts, cotton and pod crops. [read more]

The Most Polluted Communities in Maryland

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

Ranked by highest average Metolachlor level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Delmar
Delmar, MD
3,2661 of 10.9 ppb
(0.9 ppb)
2Town of Mount Airy
Mount Airy, MD
8,6313 of 50.5 ppb
(0 to 1.2 ppb)
3Mount Aetna
Williamsport, MD
6881 of 20.4 ppb
(0 to 0.8 ppb)
4Chapel Hill
Aberdeen, MD
13,1521 of 60.28 ppb
(0 to 1.7 ppb)
5Town of Hampstead
Hampstead, MD
6,0622 of 90.23 ppb
(0 to 1.75 ppb)
6Town of Union Bridge
Union Bridge, MD
9971 of 20.2 ppb
(0 to 0.4 ppb)
7City of Frederick
Frederick, MD
54,0007 of 140.11 ppb
(0 to 0.6 ppb)
8Town of North East
North East, MD
5,1902 of 90.11 ppb
(0 to 0.65 ppb)
9Fort Detrick
Frederick, MD
7,5001 of 120.09 ppb
(0 to 1.1 ppb)
10Luke / Newpage Luke Mill
Luke, MD
1843 of 110.05 ppb
(0 to 0.2 ppb)

Health Based Limits for Metolachlor

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.700 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.700 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.2000 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.3500 ppb

Violation Summary for Metolachlor in Maryland

There are no violations reported for this contaminant in Maryland