ST JOHN WATER DISTRICT 1
LA · PWS ID LA1095003 · Community water system
112
contaminants tested
30
detected
10,484
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFBA | 0.0060 ug/L | 1/3 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Chloroform | 122 UG/L | 168/169 | SYR4 | 2012–2019 |
| TTHM | 189.5 UG/L | 164/165 | SYR4 | 2012–2019 |
| Bromodichloromethane | 51.1 UG/L | 140/169 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 76.8 UG/L | 139/165 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 43.1 UG/L | 137/165 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 25.6 UG/L | 132/165 | SYR4 | 2012–2019 |
| Dibromochloromethane | 16.4 UG/L | 121/169 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 8.1 UG/L | 95/165 | SYR4 | 2012–2019 |
| COPPER, FREE | 1200 UG/L | 82/95 | SYR4 | 2014–2019 |
| Monochloroacetic acid | 25.6 UG/L | 73/165 | SYR4 | 2012–2019 |
| Lead | 7 UG/L | 59/95 | SYR4 | 2014–2019 |
| Nitrate-Nitrite | 2000 UG/L | 16/24 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 3.8 UG/L | 12/165 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0070 mg/L | 11/11 | LCR | 2024 |
| Fluoride | 900 UG/L | 10/10 | SYR4 | 2012–2019 |
| Arsenic | 2 UG/L | 9/10 | SYR4 | 2012–2019 |
| Bromoform | 2.7 UG/L | 9/169 | SYR4 | 2012–2019 |
| Dalapon | 37.35 UG/L | 8/16 | SYR4 | 2012–2019 |
| Di(2-ethylhexyl) phthalate | 1.28 UG/L | 8/18 | SYR4 | 2012–2019 |
| Barium | 60 UG/L | 5/10 | SYR4 | 2012–2019 |
| Atrazine | 0.4400 UG/L | 2/18 | SYR4 | 2012–2019 |
| Combined Radium (-226 and -228) | 0.8530 PCI/L | 2/5 | SYR4 | 2015–2019 |
| Gross Beta Particle Activity | 2.1 PCI/L | 2/10 | SYR4 | 2012–2019 |
| Selenium | 0.6500 UG/L | 2/10 | SYR4 | 2012–2019 |
| Simazine | 0.6900 UG/L | 2/18 | SYR4 | 2012–2019 |
| 1,2-Dichloroethane | 0.6000 UG/L | 1/11 | SYR4 | 2012–2019 |
| Carbon tetrachloride | 0.5000 UG/L | 1/11 | SYR4 | 2012–2019 |
| Combined Uranium | 0.5800 UG/L | 1/7 | SYR4 | 2012–2017 |
| lithium | 10.3 ug/L | 1/3 | UCMR-5 | 2025 |
82 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAsbestosBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECYANIDECadmiumCarbofuranChlordaneChromiumDICHLOROMETHANEDi(2-ethylhexyl) adipateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon and UHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorNEtFOSAANFDHANMeFOSAAOXAMYLPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFHxSPFMBAPFMPAPFNAPFOAPFOSPFPeAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene