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National Drinking Water Database


Chromium (total) in Idaho


Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits. [read more]

The Most Polluted Communities in Idaho

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

Ranked by highest average Chromium (total) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Kootenai Heights
ID
301 of 110 ppb
(10 ppb)
2M and T Water and Sewer Dist
Terreton, ID
2751 of 110 ppb
(10 ppb)
3Elk Bend Unit 1
Salmon, ID
1001 of 18 ppb
(8 ppb)
4Greenfield Water and Sewer
Shelley, ID
2401 of 17.8 ppb
(7.8 ppb)
5City of Ucon
Ucon, ID
9661 of 15.7 ppb
(5.7 ppb)
6Morning View Water Company
Rigby, ID
3001 of 15.5 ppb
(5.5 ppb)
7Camelot Water Assn Inc
Nampa, ID
1571 of 15 ppb
(5 ppb)
8Whitewater Subd
Pocatello, ID
1001 of 15 ppb
(5 ppb)
9Sohns Mobile Home Park Inc
Idaho Falls, ID
381 of 15 ppb
(5 ppb)
10Oakleaf Subdivision
Mountain Home, ID
652 of 24.5 ppb
(4 to 5 ppb)

Health Based Limits for Chromium (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.100 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.100 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.100 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.1000 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.1000 ppb

Violation Summary for Chromium (total) in Idaho

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

Violation TypeNumber of Violations
Failure to monitor regularly8