CITY OF SAN JUAN
TX · PWS ID TX1080010 · Community water system
109
contaminants tested
35
detected
30,000
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFBA | 0.0082 ug/L | 8/8 | 2025 |
| PFHxA | 0.0090 ug/L | 8/8 | 2025 |
| PFPeA | 0.0092 ug/L | 8/8 | 2025 |
| PFHpA | 0.0035 ug/L | 1/8 | 2025 |
| PFHxS | 0.0039 ug/L | 1/8 | 2025 |
| PFOS | 0.0045 ug/L | 1/8 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Chlorite | 940 UG/L | 436/440 | SYR4 | 2013–2019 |
| Bromoform | 48.2 UG/L | 130/130 | SYR4 | 2012–2019 |
| Dibromochloromethane | 34.7 UG/L | 130/130 | SYR4 | 2012–2019 |
| Bromodichloromethane | 22.2 UG/L | 127/130 | SYR4 | 2012–2019 |
| TTHM | 100 UG/L | 114/114 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 31.8 UG/L | 114/114 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 20 UG/L | 112/114 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 20.3 UG/L | 111/114 | SYR4 | 2012–2019 |
| COPPER, FREE | 430 UG/L | 90/99 | SYR4 | 2013–2017 |
| Chloroform | 11.9 UG/L | 50/130 | SYR4 | 2012–2019 |
| Nitrate | 330 UG/L | 38/40 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 3.2 UG/L | 28/114 | SYR4 | 2012–2019 |
| Fluoride | 630 UG/L | 16/16 | SYR4 | 2012–2019 |
| Barium | 131 UG/L | 14/14 | SYR4 | 2013–2019 |
| LEAD SUMMARY | 0.0061 mg/L | 13/13 | LCR | 2023 |
| Trichloroacetic Acid | 7.2 UG/L | 12/114 | SYR4 | 2012–2019 |
| CYANIDE | 200 UG/L | 10/12 | SYR4 | 2014–2019 |
| Selenium | 6.2 UG/L | 10/14 | SYR4 | 2013–2019 |
| Monochloroacetic acid | 4.5 UG/L | 9/114 | SYR4 | 2012–2019 |
| Lead | 5.01 UG/L | 8/99 | SYR4 | 2013–2017 |
| lithium | 49.8 ug/L | 8/8 | UCMR-5 | 2025 |
| Combined Uranium | 2 UG/L | 2/2 | SYR4 | 2017 |
| Gross Beta Particle Activity | 9 PCI/L | 2/2 | SYR4 | 2017 |
| Xylenes, Total | 1.2 UG/L | 2/16 | SYR4 | 2012–2019 |
| Arsenic | 2.3 UG/L | 1/14 | SYR4 | 2013–2019 |
| Carbon tetrachloride | 0.9000 UG/L | 1/16 | SYR4 | 2012–2019 |
| Combined Radium (-226 and -228) | 1.5 PCI/L | 1/1 | SYR4 | 2017 |
| Di(2-ethylhexyl) phthalate | 0.6100 UG/L | 1/19 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon and U | 2 PCI/L | 1/2 | SYR4 | 2017 |
74 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 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECadmiumCarbofuranChlordaneChromiumDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDinosebETHYLENE DIBROMIDEEndrinEthylbenzeneHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBSPFDAPFDoAPFEESAPFHpSPFMBAPFMPAPFNAPFOAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl chloridecis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene