What Total Haloacetic Acids (HAA5) is, and why it's regulated
What the EPA limit means
60 µg/L
Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.
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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 Total Haloacetic Acids (HAA5) was found
The water suppliers reporting the highest levels, worst first.
| Supplier | City | State | Level vs EPA limit |
|---|---|---|---|
| Chesterfield Co Central Water System | Chesterfield | VA | 2900 µg/L 4833% of the EPA limit, in the worst sample — 60 µg/L |
| Eagle Ridge Personal Care Home | Mill Hall | PA | 2200 µg/L 3667% of the EPA limit, in the worst sample — 60 µg/L |
| Greenhorn Subd | Ketchum | ID | 1200 µg/L 2000% of the EPA limit, in the worst sample — 60 µg/L |
| Johnsonburg Municipal Auth | Johnsonburg | PA | 1100 µg/L 1833% of the EPA limit, in the worst sample — 60 µg/L |
| J ; S Fish Camp | Okeechobee | FL | 832.45 µg/L 1387% of the EPA limit, in the worst sample — 60 µg/L |
| Icmsa Cherrytree | Indiana | PA | 795 µg/L 1325% of the EPA limit, in the worst sample — 60 µg/L |
| Vallenar View Mobile Home Park | Ketchikan | AK | 770 µg/L 1283% of the EPA limit, in the worst sample — 60 µg/L |
| City of Nome | Nome | TX | 673 µg/L 1122% of the EPA limit, in the worst sample — 60 µg/L |
| Hudson Gaars Mill Water System | Dodson | LA | 664 µg/L 1107% of the EPA limit, in the worst sample — 60 µg/L |
| Weleetka Public Works Authority | Weleetka | OK | 642 µg/L 1070% of the EPA limit, in the worst sample — 60 µg/L |
| Osage Co Rwd #20 (Hulah) | Bartlesville | OK | 606 µg/L 1010% of the EPA limit, in the worst sample — 60 µg/L |
| Titusville Estates | Conneaut Lake | PA | 568 µg/L 947% of the EPA limit, in the worst sample — 60 µg/L |
| Croft Bay Village | Hernando | MN | 567.83 µg/L 946% of the EPA limit, in the worst sample — 60 µg/L |
| Sandy Point 480 Water System | Campti | LA | 563 µg/L 938% of the EPA limit, in the worst sample — 60 µg/L |
| Murphy Hill Ws #02 | Aromas | CA | 530 µg/L 883% of the EPA limit, in the worst sample — 60 µg/L |
| Hardy County Psd Baker | Moorefield | WV | 485.816 µg/L 810% of the EPA limit, in the worst sample — 60 µg/L |
| City of Gonzales | Gonzales | TX | 480 µg/L 800% of the EPA limit, in the worst sample — 60 µg/L |
| Village of Mooringsport Water System | Mooringsport | LA | 441 µg/L 735% of the EPA limit, in the worst sample — 60 µg/L |
| City of Nacogdoches | Nacogdoches | TX | 433 µg/L 722% of the EPA limit, in the worst sample — 60 µg/L |
| Fairview Union Water System | Coushatta | LA | 422 µg/L 703% of the EPA limit, in the worst sample — 60 µg/L |
| Wenden Dwid | Wenden | AZ | 420 µg/L 700% of the EPA limit, in the worst sample — 60 µg/L |
| Cambridge Area Joint Auth | Cambridge Springs | PA | 415 µg/L 692% of the EPA limit, in the worst sample — 60 µg/L |
| City of Strawn | Strawn | TX | 408 µg/L 680% of the EPA limit, in the worst sample — 60 µg/L |
| Lemoore, City of | Lemoore | CA | 400 µg/L 667% of the EPA limit, in the worst sample — 60 µg/L |
| Otoe-Missouria Tribe | Red Rock | OK | 394 µg/L 657% of the EPA limit, in the worst sample — 60 µg/L |
Frequently asked questions about Total Haloacetic Acids (HAA5)
What is Total Haloacetic Acids (HAA5) in drinking water?
Haloacetic acids are chlorination by-products; long-term exposure raises cancer risk.
What is the EPA limit for Total Haloacetic Acids (HAA5)?
The EPA's Maximum Contaminant Level for Total Haloacetic Acids (HAA5) is 60 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 Total Haloacetic Acids (HAA5) in US tap water?
Of the 34,024 water suppliers with results on file, 27,470 detected Total Haloacetic Acids (HAA5) — 80.7% of those tested.