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Contaminant guide

Combined Radium (-226 And -228) in drinking water

The EPA limit for Combined Radium (-226 And -228) in drinking water is 5 pCi/L. Of the 20,974 water suppliers tested, 14,619 had it detected.

5 pCi/L
EPA limit (MCL)
69.7%
of suppliers detected it
(14,619/20,974)

What Combined Radium (-226 And -228) is, and why it's regulated

Radium is a naturally radioactive metal in some aquifers; long-term exposure raises the risk of bone cancer.

What the EPA limit means

⚖️

5 pCi/L

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

🎯

0.0 pCi/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 Radium (-226 And -228) 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
Silver Creek Village Wsc Burnet TX
365.8 pCi/L 7316%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Cherokee - Snowbird/Cornsilk Community Cherokee NC
150.252 pCi/L 3005%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Mill Pond Crossing Brentwood NH
150.2 pCi/L 3004%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Millersview Doole Wsc Millersview TX
81.04 pCi/L 1621%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Tow Water System — TX
52.5 pCi/L 1050%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Council Creek Village — MO
45.985 pCi/L 920%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
City of Brady Water System Brady TX
45.3 pCi/L 906%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
City of San Angelo San Angelo TX
42.68 pCi/L 854%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
South Council Creek 2 — MO
39.605 pCi/L 792%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
East Windsor Housing Authority East Windsor CT
36.1283 pCi/L 723%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Holland Tn Sanitary Dist Town of Holland WI
36.094 pCi/L 722%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Woodhall School, Inc Bethlehem CT
35.7395 pCi/L 715%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Patterson Valley Wc Rocky Ford CO
31.2 pCi/L 624%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Monterey Rural Water System Inc Monterey LA
25.96 pCi/L 519%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Tanglewood Forest Subdivision — TX
25.61 pCi/L 512%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
May Valley Wa Wiley CO
25 pCi/L 500%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Perry County Pwsd 1 Perryville MO
24.7 pCi/L 494%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Tsaile-Dine College Ntua Tsaile, Dine College AZ
23.76 pCi/L 475%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
South Swink Water Authority La Junta CO
23.3 pCi/L 466%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
South Silver Creek I Ii & Iii — MO
22.62 pCi/L 452%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Braidwood Braidwood IL
22.2 pCi/L 444%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Eureka Wc Rocky Ford CO
22 pCi/L 440%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Fayette Wc Manzanola CO
22 pCi/L 440%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Wilmington Wilmington IL
20.825 pCi/L 417%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Bayshore Mobile Home Park Stow Creek twp.-0612 NJ
20.174 pCi/L 403%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L

Frequently asked questions about Combined Radium (-226 And -228)

What is Combined Radium (-226 And -228) in drinking water?

Radium is a naturally radioactive metal in some aquifers; long-term exposure raises the risk of bone cancer.

What is the EPA limit for Combined Radium (-226 And -228)?

The EPA's Maximum Contaminant Level for Combined Radium (-226 And -228) is 5 pCi/L, and its health goal (MCLG) is 0.0 pCi/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 Radium (-226 And -228) in US tap water?

Of the 20,974 water suppliers with results on file, 14,619 detected Combined Radium (-226 And -228) — 69.7% of those tested.