What Thallium, Total is, and why it's regulated
What the EPA limit means
2 µg/L
Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.
0.5000 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 Thallium, Total 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.
| Supplier | City | State | Level vs EPA limit |
|---|---|---|---|
| Carlsbad Desalination Plant | Carlsbad | CA | 173 µg/L 8650% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Rancho Carrillo Mwc | Rancho Mission Viejo | CA | 120 µg/L 6000% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Ocotillo Oasis, Llc | San Marcos | CA | 71 µg/L 3550% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Rancho Estates Mutual Water Co. | Pauma Valley | CA | 38 µg/L 1900% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| City of Minden Water System | Minden | LA | 37.11 µg/L 1856% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Salt Lake City Water System | Salt Lake City | UT | 25.56 µg/L 1278% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Santa Ynez Roblar Mobile Home Park | — | CA | 24 µg/L 1200% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Lebanon Pws | Lebanon | MO | 17.086 µg/L 854% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| San Pasqual District a | Valley Center | CA | 15 µg/L 750% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Cottonwood Municipal Water vv2 | Cottonwood | AZ | 11 µg/L 550% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Oak River Ranch | — | TX | 10.4 µg/L 520% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Borden County Water System | Gail | TX | 10.3738 µg/L 519% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Columbia County-Ellisville | Lake City | FL | 10.3 µg/L 515% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Coyote Valley Rv Resort | Los Gatos | CA | 10 µg/L 500% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Barona North | Barona North Reservation | CA | 10 µg/L 500% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Leisure Pines Mutual Water Co | Twain Harte | CA | 7.8 µg/L 390% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| West Kern Water District | Taft | CA | 7.3 µg/L 365% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Concordia Waterworks District 1 | Ferriday | LA | 7 µg/L 350% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Colonial Forest | — | — | 6.27 µg/L 314% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Butterfield Common Senior Housing | Dover | NH | 6 µg/L 300% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Truckee Meadows Water Authority | Sparks | NV | 5.89 µg/L 295% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Mo American Stonebridge Village | — | MO | 5.64 µg/L 282% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Fallsburg Who-Ls-Sf | Fallsburg | NY | 5 µg/L 250% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Lehi City | Lehi | UT | 4.92 µg/L 246% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
| Alderson Water | Alderson | WV | 4.7 µg/L 235% of the EPA limit, at the 95th percentile of samples — 2 µg/L |
Frequently asked questions about Thallium, Total
What is Thallium, Total in drinking water?
Thallium is released by ore processing and electronics plants; it can affect the liver, kidneys and nervous system.
What is the EPA limit for Thallium, Total?
The EPA's Maximum Contaminant Level for Thallium, Total is 2 µg/L, and its health goal (MCLG) is 0.5000 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 Thallium, Total in US tap water?
Of the 33,770 water suppliers with results on file, 1,396 detected Thallium, Total — 4.1% of those tested.