SAMMAMISH PLATEAU WATER & SEWER
WA · PWS ID WA5340900 · Community water system
106
contaminants tested
25
detected
79,362
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHxS | 0.0165 ug/L | 9/16 | 2024 |
| PFBS | 0.0088 ug/L | 6/16 | 2024 |
| PFOS | 0.0111 ug/L | 4/16 | 2024 |
| PFHxA | 0.0043 ug/L | 2/16 | 2024 |
| PFPeA | 0.0039 ug/L | 2/16 | 2024 |
| PFPeS | 0.0041 ug/L | 1/16 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 73.07 UG/L | 259/259 | SYR4 | 2012–2019 |
| Chloroform | 67.7 UG/L | 258/267 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 49.9 UG/L | 249/249 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 29.6 UG/L | 247/247 | SYR4 | 2012–2019 |
| Bromodichloromethane | 8.27 UG/L | 244/259 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 23.6 UG/L | 239/244 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.2 UG/L | 119/257 | SYR4 | 2012–2019 |
| Nitrate | 2300 UG/L | 80/130 | SYR4 | 2012–2019 |
| Monochloroacetic acid | 4.2 UG/L | 30/248 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0060 mg/L | 24/24 | LCR | 2025 |
| Fluoride | 800 UG/L | 14/18 | SYR4 | 2012–2018 |
| Arsenic | 6.6 UG/L | 8/18 | SYR4 | 2012–2018 |
| Nitrate-Nitrite | 1900 UG/L | 8/18 | SYR4 | 2012–2018 |
| Dibromoacetic acid | 0.6660 UG/L | 6/250 | SYR4 | 2012–2019 |
| COPPER, FREE | 31 UG/L | 3/18 | SYR4 | 2012–2018 |
| Bromoform | 0.6500 UG/L | 2/268 | SYR4 | 2012–2019 |
| Lead | 4 UG/L | 2/18 | SYR4 | 2012–2018 |
| Asbestos | 0.1150 MFL | 1/1 | SYR4 | 2017 |
| Cadmium | 0.2000 UG/L | 1/18 | SYR4 | 2012–2018 |
81 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, TotalAtrazineBHC-GAMMABariumBenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECYANIDECarbofuranCarbon tetrachlorideChlordaneChromiumDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebETHYLENE DIBROMIDEEndrinEthylbenzeneHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorMonobromoacetic acidNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBAPFDAPFDoAPFEESAPFHpAPFHpSPFMBAPFMPAPFNAPFOAPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethylenelithiumo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene