CITY OF HOUSTON
TX · PWS ID TX1010013 · Community water system
109
contaminants tested
42
detected
2,970,543
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHxA | 0.0051 ug/L | 16/96 | 2025 |
| PFPeA | 0.0067 ug/L | 11/96 | 2025 |
| 6:2 FTS | 0.0426 ug/L | 10/96 | 2025 |
| PFBA | 0.0106 ug/L | 9/96 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 16.6 UG/L | 613/773 | SYR4 | 2012–2019 |
| Chloroform | 67.3 UG/L | 607/773 | SYR4 | 2012–2019 |
| Nitrate | 1230 UG/L | 536/712 | SYR4 | 2012–2019 |
| Dibromochloromethane | 20 UG/L | 525/773 | SYR4 | 2012–2019 |
| TTHM | 75.8 UG/L | 514/518 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 73.1 UG/L | 504/518 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 50.9 UG/L | 503/518 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 21.5 UG/L | 495/518 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 13.3 UG/L | 299/518 | SYR4 | 2012–2019 |
| COPPER, FREE | 1930 UG/L | 221/309 | SYR4 | 2012–2019 |
| Barium | 400 UG/L | 155/155 | SYR4 | 2012–2019 |
| Fluoride | 760 UG/L | 153/158 | SYR4 | 2012–2019 |
| Atrazine | 0.9100 UG/L | 96/227 | SYR4 | 2012–2019 |
| Monochloroacetic acid | 11.9 UG/L | 96/518 | SYR4 | 2012–2019 |
| Arsenic | 11 UG/L | 85/161 | SYR4 | 2012–2019 |
| Bromoform | 11 UG/L | 84/773 | SYR4 | 2012–2019 |
| Lead | 48.9 UG/L | 77/309 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 350 UG/L | 69/95 | SYR4 | 2012–2019 |
| lithium | 33.9 ug/L | 69/96 | UCMR-5 | 2025 |
| Simazine | 0.2900 UG/L | 58/227 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon and U | 11.1 PCI/L | 52/68 | SYR4 | 2013–2019 |
| Combined Radium (-226 and -228) | 5.3 PCI/L | 48/63 | SYR4 | 2012–2019 |
| Selenium | 12.9 UG/L | 39/155 | SYR4 | 2012–2019 |
| Combined Uranium | 16.9 UG/L | 35/68 | SYR4 | 2013–2019 |
| Gross Beta Particle Activity | 8.7 PCI/L | 35/77 | SYR4 | 2012–2019 |
| CYANIDE | 110 UG/L | 34/117 | SYR4 | 2014–2019 |
| Xylenes, Total | 13 UG/L | 30/257 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0075 mg/L | 17/17 | LCR | 2024 |
| Di(2-ethylhexyl) phthalate | 1.8 UG/L | 12/226 | SYR4 | 2012–2019 |
| Nitrite | 40 UG/L | 8/108 | SYR4 | 2012–2019 |
| Ethylbenzene | 2.2 UG/L | 6/257 | SYR4 | 2012–2019 |
| Hexachlorocyclopentadiene | 0.2400 UG/L | 6/227 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 4.5 UG/L | 4/518 | SYR4 | 2012–2019 |
| Chromium | 14.3 UG/L | 3/155 | SYR4 | 2012–2019 |
| Benzo(a)pyrene | 0.0400 UG/L | 1/227 | SYR4 | 2012–2019 |
| DICHLOROMETHANE | 0.5000 UG/L | 1/257 | SYR4 | 2012–2019 |
| Endrin | 0.0100 UG/L | 1/227 | SYR4 | 2012–2019 |
| Toluene | 1 UG/L | 1/257 | SYR4 | 2012–2019 |
67 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAsbestosBHC-GAMMABenzeneBeryllium, TotalCHLOROBENZENECadmiumCarbofuranCarbon tetrachlorideChlordaneDalaponDi(2-ethylhexyl) adipateDinosebETHYLENE DIBROMIDEHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideLASSOMercuryMethoxychlorNEtFOSAANFDHANMeFOSAAOXAMYLPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxSPFMBAPFMPAPFNAPFOAPFOSPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramStyreneTetrachloroethyleneThallium, TotalToxapheneTrichloroethyleneVinyl chloridecis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene