All contaminants
Sorted by how many water suppliers detected each one. “Over limit” is only counted where the published figure is the one the limit is written against — the lead and copper 90th percentile.
| Contaminant | EPA limit | Detected in | Over limit | Source |
|---|---|---|---|---|
| Lead | 0.0150 mg/L | 47,629 measured | 4,246 | LCR |
| Copper | 1300 µg/L | 32,617 (89%) | — | SYR4 |
| TTHM | 80 µg/L | 30,898 (86.9%) | — | SYR4 |
| Lead | 15 µg/L | 28,796 (79.8%) | — | SYR4 |
| Total Haloacetic Acids (HAA5) | 60 µg/L | 27,470 (80.7%) | — | SYR4 |
| Barium | 2000 µg/L | 26,603 (78.9%) | — | SYR4 |
| Fluoride | 4000 µg/L | 25,909 (76.5%) | — | SYR4 |
| Nitrate | 10000 µg/L | 24,520 (82.6%) | — | SYR4 |
| Chloroform | — | 24,215 (71.6%) | — | SYR4 |
| Bromodichloromethane | — | 24,091 (71.4%) | — | SYR4 |
| Dibromochloromethane | — | 23,644 (70.1%) | — | SYR4 |
| Dichloroacetic Acid | — | 19,963 (69.6%) | — | SYR4 |
| Nitrate-Nitrite | 10000 µg/L | 18,509 (76.7%) | — | SYR4 |
| Trichloroacetic Acid | — | 17,340 (60.4%) | — | SYR4 |
| Dibromoacetic Acid | — | 16,842 (58.7%) | — | SYR4 |
| Bromoform | — | 16,756 (49.7%) | — | SYR4 |
| Arsenic | 10 µg/L | 15,303 (45%) | — | SYR4 |
| Combined Radium (-226 And -228) | 5 pCi/L | 14,619 (69.7%) | — | SYR4 |
| Chromium | 100 µg/L | 10,760 (31.9%) | — | SYR4 |
| Monochloroacetic Acid | — | 10,754 (37.5%) | — | SYR4 |
| Gross Alpha, Excl. Radon And U | 15 pCi/L | 9,273 (57.2%) | — | SYR4 |
| Monobromoacetic Acid | — | 8,205 (28.6%) | — | SYR4 |
| Selenium | 50 µg/L | 7,995 (23.7%) | — | SYR4 |
| Combined Uranium | 30 µg/L | 7,746 (44.1%) | — | SYR4 |
| Gross Beta Particle Activity | — | 6,294 (58.8%) | — | SYR4 |
| Lithium | — | 3,552 (36.7%) | — | UCMR-5 |
| Xylenes, Total | 10000 µg/L | 3,013 (9.7%) | — | SYR4 |
| Di(2-ethylhexyl) Phthalate | 6 µg/L | 2,772 (11.1%) | — | SYR4 |
| Nitrite | 1000 µg/L | 2,483 (10.2%) | — | SYR4 |
| Cyanide | 200 µg/L | 2,240 (8.7%) | — | SYR4 |
| Antimony, Total | 6 µg/L | 2,090 (6.2%) | — | SYR4 |
| Pfpea | — | 1,948 (20.1%) | — | UCMR-5 |
| Pfba | — | 1,819 (18.8%) | — | UCMR-5 |
| Pfhxa | — | 1,707 (17.6%) | — | UCMR-5 |
| PFBS | — | 1,599 (16.5%) | — | UCMR-5 |
| Toluene | 1000 µg/L | 1,467 (4.2%) | — | SYR4 |
| Thallium, Total | 2 µg/L | 1,396 (4.1%) | — | SYR4 |
| Atrazine | 3 µg/L | 1,368 (4.6%) | — | SYR4 |
| Ethylbenzene | 700 µg/L | 1,362 (3.9%) | — | SYR4 |
| PFOS | — | 1,290 (13.3%) | — | UCMR-5 |
| PFOA | — | 1,222 (12.6%) | — | UCMR-5 |
| Mercury | 2 µg/L | 1,160 (3.4%) | — | SYR4 |
| Cadmium | 5 µg/L | 1,044 (3.1%) | — | SYR4 |
| PFHXS | — | 970 (10%) | — | UCMR-5 |
| Dalapon | 200 µg/L | 840 (3.1%) | — | SYR4 |
| Tetrachloroethylene | 5 µg/L | 768 (2.2%) | — | SYR4 |
| Beryllium, Total | 4 µg/L | 658 (2%) | — | SYR4 |
| Dichloromethane | 5 µg/L | 602 (1.7%) | — | SYR4 |
| Trichloroethylene | 5 µg/L | 567 (1.6%) | — | SYR4 |
| Pfhpa | — | 529 (5.5%) | — | UCMR-5 |
| Simazine | 4 µg/L | 477 (1.7%) | — | SYR4 |
| Carbon Tetrachloride | 5 µg/L | 438 (1.3%) | — | SYR4 |
| Chlorite | 1000 µg/L | 356 (78.1%) | — | SYR4 |
| 2,4-D | 70 µg/L | 309 (1.1%) | — | SYR4 |
| Hexachlorocyclopentadiene | 50 µg/L | 288 (1.1%) | — | SYR4 |
| cis-1,2-Dichloroethylene | 70 µg/L | 286 (0.8%) | — | SYR4 |
| Di(2-ethylhexyl) Adipate | 400 µg/L | 227 (0.9%) | — | SYR4 |
| Styrene | 100 µg/L | 226 (0.7%) | — | SYR4 |
| 1,1-Dichloroethylene | 7 µg/L | 224 (0.6%) | — | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.2000 µg/L | 223 (0.9%) | — | SYR4 |
| P-Dichlorobenzene | 75 µg/L | 199 (0.6%) | — | SYR4 |
| Picloram | 500 µg/L | 187 (0.7%) | — | SYR4 |
| Asbestos | 7 MFL | 186 (1.8%) | — | SYR4 |
| Pentachlorophenol | 1 µg/L | 186 (0.7%) | — | SYR4 |
| Benzo(A)Pyrene | 0.2000 µg/L | 184 (0.7%) | — | SYR4 |
| 6:2 Fts | — | 179 (1.8%) | — | UCMR-5 |
| Benzene | 5 µg/L | 174 (0.5%) | — | SYR4 |
| Bromate | 10 µg/L | 167 (49.4%) | — | SYR4 |
| 1,2-Dichloroethane | 5 µg/L | 166 (0.5%) | — | SYR4 |
| 1,1,1-Trichloroethane | 200 µg/L | 160 (0.5%) | — | SYR4 |
| Heptachlor Epoxide | 0.2000 µg/L | 159 (0.6%) | — | SYR4 |
| Ethylene Dibromide | 0.0500 µg/L | 137 (0.5%) | — | SYR4 |
| Hexachlorobenzene | 1 µg/L | 125 (0.5%) | — | SYR4 |
| Chlorobenzene | 100 µg/L | 117 (0.3%) | — | SYR4 |
| 1,2-Dichloropropane | 5 µg/L | 107 (0.3%) | — | SYR4 |
| Vinyl Chloride | 2 µg/L | 105 (0.3%) | — | SYR4 |
| Chlordane | 2 µg/L | 99 (0.4%) | — | SYR4 |
| trans-1,2-Dichloroethylene | 100 µg/L | 99 (0.3%) | — | SYR4 |
| Diquat | 20 µg/L | 96 (0.7%) | — | SYR4 |
| Endrin | 2 µg/L | 96 (0.4%) | — | SYR4 |
| 1,2,4-Trichlorobenzene | 70 µg/L | 79 (0.2%) | — | SYR4 |
| PFNA | — | 77 (0.8%) | — | UCMR-5 |
| Bhc-Gamma | 0.2000 µg/L | 73 (0.3%) | — | SYR4 |
| 1,1,2-Trichloroethane | 5 µg/L | 63 (0.2%) | — | SYR4 |
| Methoxychlor | 40 µg/L | 60 (0.2%) | — | SYR4 |
| Carbofuran | 40 µg/L | 56 (0.2%) | — | SYR4 |
| O-Dichlorobenzene | 600 µg/L | 53 (0.2%) | — | SYR4 |
| Dinoseb | 7 µg/L | 52 (0.2%) | — | SYR4 |
| Glyphosate | 700 µg/L | 46 (0.3%) | — | SYR4 |
| Lasso | 2 µg/L | 46 (0.2%) | — | SYR4 |
| Hfpo-Da | — | 45 (0.5%) | — | UCMR-5 |
| Heptachlor | 0.4000 µg/L | 45 (0.2%) | — | SYR4 |
| Pfpes | — | 44 (0.5%) | — | UCMR-5 |
| Endothall | 100 µg/L | 39 (0.3%) | — | SYR4 |
| 2,4,5-TP | 50 µg/L | 37 (0.1%) | — | SYR4 |
| Oxamyl | 200 µg/L | 37 (0.1%) | — | SYR4 |
| Total Polychlorinated Biphenyls (PCB) | 0.5000 µg/L | 37 (0.2%) | — | SYR4 |
| Toxaphene | 3 µg/L | 35 (0.1%) | — | SYR4 |
| 2,3,7,8-TCDD | 0.000030 µg/L | 18 (0.4%) | — | SYR4 |
| Pfda | — | 13 (0.1%) | — | UCMR-5 |
| 8:2 Fts | — | 10 (0.1%) | — | UCMR-5 |
| Pfuna | — | 6 (0.1%) | — | UCMR-5 |
| Pfhps | — | 5 (0.1%) | — | UCMR-5 |
| Nfdha | — | 4 (0%) | — | UCMR-5 |
| Pfdoa | — | 4 (0%) | — | UCMR-5 |
| Adona | — | 3 (0%) | — | UCMR-5 |
| 4:2 Fts | — | 2 (0%) | — | UCMR-5 |
| Pfmpa | — | 2 (0%) | — | UCMR-5 |
| 9Cl-PF3ONS | — | 1 (0%) | — | UCMR-5 |
| Netfosaa | — | 1 (0%) | — | UCMR-5 |
| Nmefosaa | — | 1 (0%) | — | UCMR-5 |
| Pfmba | — | 1 (0%) | — | UCMR-5 |
| — | 0 (0%) | — | UCMR-5 | |
| 11Cl-PF3OUdS | — | 0 (0%) | — | UCMR-5 |
| Pfeesa | — | 0 (0%) | — | UCMR-5 |
| Pfta | — | 0 (0%) | — | UCMR-5 |
| Pftrda | — | 0 (0%) | — | UCMR-5 |