The Power of Information

National Drinking Water Database

Combined Uranium (mg/L) in Oregon

Uranium is a radioactive element commonly found in most rocks; processed uranium ore is used for power generation and weapons manufacture. [read more]

The Most Polluted Communities in Oregon

36 water utilities reported detecting Combined Uranium (mg/L) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Combined Uranium (mg/L) level

RankSystem Population Served Positive test results of total reported tests Average Level
1River Village Mhp
Ontario, OR
2811 of 1128.4 ppb
(0.03 to 56.5 ppb)
2City of Irrigon
Irrigon, OR
1,7405 of 612.67 ppb
(0 to 21 ppb)
3Whispering Pines MH Village
Tucson, OR
1201 of 112 ppb
(12 ppb)
4City of Nyssa
Nyssa, OR
3,1701 of 16.3 ppb
(6.3 ppb)
5City of Vale
Vale, OR
1,9971 of 14.05 ppb
(4.05 ppb)
6City of Spray
Spray, OR
1502 of 24.02 ppb
(4.02 ppb)
7Arlington City Water Supply
Arlington, OR
5501 of 13 ppb
(3 ppb)
8Hat Rock Water Company
Hermiston, OR
801 of 12 ppb
(2 ppb)
9Avion WC - South Redmond Heights
Bend, OR
1752 of 22 ppb
(2 ppb)
10Smith Rock Mobile Estates
Redmond, OR
601 of 12 ppb
(2 ppb)

Health Based Limits for Combined Uranium (mg/L)

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.0 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.0.5 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.20 ppb
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.30 ppb

Violation Summary for Combined Uranium (mg/L) in Oregon

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

Violation TypeNumber of Violations
Over maximum contaminant level, Average1