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National Drinking Water Database


Chromium (total) in Oklahoma


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 Oklahoma

39 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)
1Okla Christian University Sa
Oklahoma City, OK
1,8001 of 154 ppb
(54 ppb)
2Cedar Ridge Estates Development Co
Oklahoma City, OK
1101 of 150 ppb
(50 ppb)
3Norman
Norman, OK
89,9529 of 941.7 ppb
(24.83 to 61.4 ppb)
4Noble
Noble, OK
5,2602 of 231.13 ppb
(11.27 to 51 ppb)
5Moore
Moore, OK
41,1384 of 430.46 ppb
(25.38 to 35.5 ppb)
6Lexington Corr Inst
Lexington, OK
1,0001 of 125.23 ppb
(25.23 ppb)
7Mcloud
Mcloud, OK
2,5003 of 322.98 ppb
(5.83 to 39 ppb)
8Piedmont
Piedmont, OK
3,6501 of 122.23 ppb
(22.23 ppb)
9Nichols Hills
Nichols Hills, OK
4,0562 of 420.73 ppb
(0 to 52 ppb)
10Waterfront Acres
Choctaw, OK
432 of 219.2 ppb
(10.4 to 28 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 Oklahoma

There are no violations reported for this contaminant in Oklahoma