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Contaminant guide

Combined Uranium in drinking water

The EPA limit for Combined Uranium in drinking water is 30 µg/L. Of the 17,579 water suppliers tested, 7,746 had it detected.

30 µg/L
EPA limit (MCL)
44.1%
of suppliers detected it
(7,746/17,579)

What Combined Uranium is, and why it's regulated

Uranium occurs naturally in granite and sandstone aquifers; it is toxic to the kidneys and slightly carcinogenic.

What the EPA limit means

⚖️

30 µg/L

Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.

🎯

0.0 µg/L

Health goal (MCLG) — the level with no known health effect. It is a goal, not a legal limit, and is often zero for carcinogens.

🧪

SYR4

Where these measurements come from. Hover the tag for the EPA programme and years.

Where Combined Uranium was found

The water suppliers reporting the highest levels, worst first. For lead and copper that is the 90th-percentile result the action level is written against; for Six-Year Review data, the 95th percentile of each system's samples.

SupplierCityStateLevel vs EPA limit
Sugar City City of Sugar City ID
1818.18 µg/L 6061%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Crawford Hills Bartlett MA
1350.5 µg/L 4502%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Sierra Linda Mutual Water Co North Fork CA
571.527 µg/L 1905%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Shady Oaks Mobile Home Park Llc — CA
549.698 µg/L 1832%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Rolling Acres Mhp Mont Vernon NY
440.4 µg/L 1468%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Md 07 Marina View Heights Madera CA
407.306 µg/L 1358%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Two Twenty Four Mobile Home Pk — CA
342.7 µg/L 1142%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Cal Am - Bass Lake — CA
339.422 µg/L 1131%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Oakvale Park Escondido CA
309.92 µg/L 1033%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Cal Am - Oakhurst — CA
309.92 µg/L 1033%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Rockbridge S/D Knightdale NC
245.5 µg/L 818%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Pike Ranch Mutual Water Co Oakhurst CA
228.715 µg/L 762%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Rancho Santa Teresa Mw Co. Ramona CA
223.5 µg/L 745%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Pine Valley Trailer Park Costa Mesa CA
214.786 µg/L 716%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Arrowbear Park Cwd Arrowbear Lake CA
208.6 µg/L 695%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Portland Water District-Greater Windham ME
190.01 µg/L 633%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Arrowhead Ranch Water Company Llc Sandpoint ID
187.6 µg/L 625%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Lake Arrowhead Csd Lake Arrowhead CA
178.8 µg/L 596%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Logan Co Rwd #1 Guthrie OK
175.725 µg/L 586%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Freedom Village Condos Freedom NH
170.15 µg/L 567%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Blue Sky Heights Wua Clancy Clancy MT
164 µg/L 547%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
South Kingstown Nursing and Rehab South Kingstown RI
161.562 µg/L 539%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Skyland Md Crested Butte CO
152.009 µg/L 507%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Poland Place Condo Association Poland ME
142 µg/L 473%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
Cornerstone Place Deerfield NH
140.395 µg/L 468%
of the EPA limit, at the 95th percentile of samples — 30 µg/L

Frequently asked questions about Combined Uranium

What is Combined Uranium in drinking water?

Uranium occurs naturally in granite and sandstone aquifers; it is toxic to the kidneys and slightly carcinogenic.

What is the EPA limit for Combined Uranium?

The EPA's Maximum Contaminant Level for Combined Uranium is 30 µg/L, and its health goal (MCLG) is 0.0 µg/L. A result above the limit means the supplier must act; the goal is the level at which no health effects are expected.

How common is Combined Uranium in US tap water?

Of the 17,579 water suppliers with results on file, 7,746 detected Combined Uranium — 44.1% of those tested.