The Power of Information

National Drinking Water Database


Selenium (total) in Nevada


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 Nevada

26 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
(Range)
1Devils Gate Gid District 1
Eureka, NV
252 of 211.23 ppb
(3.45 to 19 ppb)
2Vans Trailer Oasis
Lake Forest, NV
751 of 18.7 ppb
(8.7 ppb)
3Rainbow Gardens Water Users
Mt Charleston, NV
451 of 18.2 ppb
(8.2 ppb)
4Imlay Water System
Lovelock, NV
2001 of 17 ppb
(7 ppb)
5Nps Cottonwood Cove
Boulder City, NV
1,3541 of 16 ppb
(6 ppb)
6Spring Creek Mhp
Pahrump, NV
4,1461 of 15 ppb
(5 ppb)
7Searchlight Water Company
Las Vegas, NV
7602 of 35 ppb
(0 to 8 ppb)
8Five Star Mhp
Las Vegas, NV
901 of 15 ppb
(5 ppb)
9Oakridge Apartments
Mt Charleston, NV
1261 of 14.5 ppb
(4.5 ppb)
10Nps Overton Beach
Boulder City, NV
2502 of 23.5 ppb
(2 to 5 ppb)

Health Based Limits for Selenium (total)

StandardDescriptionLevel
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 Nevada

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

Violation TypeNumber of Violations
Failure to monitor regularly3