The Power of Information

National Drinking Water Database

Selenium (total) in New Hampshire

Selenium is a naturally occurring element that contaminates water due to mining or petrolum refining, fly-ash from coal-burning power plants, and irrigation of arid farmland soils high in selenium. [read more]

The Most Polluted Communities in New Hampshire

11 water utilities reported detecting Selenium (total) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Selenium (total) level

RankSystem Population Served Positive test results of total reported tests Average Level
1Collins Landing
1131 of 16.9 ppb
(6.9 ppb)
2Market Basket
2501 of 15.7 ppb
(5.7 ppb)
3Lisbon Water Department
Lisbon, NH
1,0501 of 15 ppb
(5 ppb)
4Chocorua Meadows
Tamworth, NH
501 of 13 ppb
(3 ppb)
5Keene Water Dept
Keene, NH
25,0001 of 12 ppb
(2 ppb)
6Pickpocket Woods
Exeter, NH
281 of 11.2 ppb
(1.2 ppb)
7Webster Elementary School
1001 of 11 ppb
(1 ppb)
8Bobs Mobile Home Park
Milan, NH
551 of 10.6 ppb
(0.6 ppb)
9City of Dover Water Dept
Dover, NH
28,0001 of 10.6 ppb
(0.6 ppb)
1032 Constitution Dr
1001 of 10.6 ppb
(0.6 ppb)

Health Based Limits for Selenium (total)

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.50 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.50 ppb
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.50 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.170 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.200 ppb

Violation Summary for Selenium (total) in New Hampshire

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in New Hampshire since 2004

Violation TypeNumber of Violations
Failure to monitor regularly9