- PWSID
- WA5372250
- State
- Washington
- System type
- community water system (CWS)
- Population served
- 106,499
- City
- Richland
- Counties
- Benton County
- Primary source water
- surface water
- UCMR 5 sampling
- 2023-03-13 to 2023-12-04 · 4 entry point(s) · water types: GW;SW
- Service-area boundary
- authoritative
PFOS ≥ 3 × its limit highest single result
PFOS ≥ 3 × its limit worst entry-point average
Open on the Washington map · All Washington systems · All results
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Compared with EPA's 2024 values
| Highest single result | Worst entry-point average* | Limit | |
|---|---|---|---|
| PFOA (ppt) | 10.1 | 10.1 | 4 |
| PFOS (ppt) | 17 | 17 | 4 |
| Hazard Index | 0.543 | 0.543 | 1.0† |
“<MRL” = every result for the compound was below its reporting limit. * Mean of all samples at each entry point with non-detects = 0 (EPA compliance convention; the Hazard Index also uses non-detects = 0); a screening comparison, not a formal running annual average. † Rescission proposed May 2026. PFOA/PFOS MCL 4 ppt (2024 NPDWR, in effect). PFHxS, PFNA, HFPO-DA (10 ppt each) and the Hazard Index (1.0) are 2024 NPDWR values; EPA proposed rescinding them on 18 May 2026 (comment period closed 20 Jul 2026).
Compared with Washington standards
| Highest single result | Worst entry-point average* | Washington | |
|---|---|---|---|
| PFOA (ppt) | 10.1 | 10.1 | 4 |
| PFOS (ppt) | 17 | 17 | 4 |
| PFNA (ppt) | 0 | 0 | 10 |
| PFHxS (ppt) | 5.4 | 5.4 | 10 |
| HFPO-DA (GenX) (ppt) | 0 | 0 | 10 |
Sum standards add the listed compounds within each sample (non-detects = 0). State compliance is normally judged on averages over time; these are screening comparisons.
Sampling history
Sampled 2023-03-13 to 2023-12-04 · 4 entry point(s) · water types: GW;SW · 12 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-03-13 | Columbia River (SW) | SE1 | <4 | <4 | 0 | none |
| 2023-03-13 | WLSN WY/S12-15 (GW) | SE1 | 4.8 | 5 | 0.543 | PFHxA 6.6, PFPeA 7.4 |
| 2023-03-23 | N. Richland Slow Sand Filter Facility (SW) | SE1 | <4 | <4 | 0 | none |
| 2023-03-27 | Columbia Well (GW) | SE1 | 10.1 | 17 | 0.494 | PFBA 6.6, PFHpA 5.8, PFHxA 11.6, PFPeA 14.5 |
| 2023-05-02 | Columbia Well (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-05-02 | N. Richland Slow Sand Filter Facility (SW) | SE1 | n/a | n/a | n/a | none |
| 2023-06-21 | Columbia River (SW) | SE2 | <4 | <4 | 0 | none |
| 2023-06-21 | N. Richland Slow Sand Filter Facility (SW) | SE2 | <4 | <4 | 0 | none |
| 2023-09-06 | Columbia River (SW) | SE3 | <4 | <4 | 0 | none |
| 2023-09-06 | N. Richland Slow Sand Filter Facility (SW) | SE3 | <4 | <4 | 0 | none |
| 2023-12-04 | Columbia River (SW) | SE4 | <4 | <4 | 0 | none |
| 2023-12-04 | N. Richland Slow Sand Filter Facility (SW) | SE4 | <4 | <4 | 0 | none |
“<4” = not detected at the reporting limit shown; “n/a” = not analyzed in that sample. Highlighted = at or above the 4 ppt MCL. HI computed per sample with non-detects as 0. Other detections lists every other quantified compound (lithium in µg/L).
All results by entry point
300 results. Each column is one sampling visit (date and UCMR 5 sample event). A number is a measured concentration; “< 4” = below the minimum reporting level shown; “–” = not analyzed in that visit. PFAS in ppt (ng/L); lithium in µg/L.
Columbia River facility 00001 · sample point S01 · surface water
| Compound | MRL | 2023-03-13 SE1 | 2023-06-21 SE2 | 2023-09-06 SE3 | 2023-12-04 SE4 |
|---|---|---|---|---|---|
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 |
| PFBA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| PFBS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHxA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHxS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFOS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFPeA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFPeS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 | < 9 | < 9 |
Columbia Well facility 00005 · sample point S05 · groundwater
| Compound | MRL | 2023-03-27 SE1 | 2023-05-02 SE1 |
|---|---|---|---|
| PFBA | 5 ppt | 6.6 | – |
| PFBS | 3 ppt | 8.9 | – |
| PFHpA | 3 ppt | 5.8 | – |
| PFHxA | 3 ppt | 11.6 | – |
| PFHxS | 3 ppt | 4.9 | – |
| PFOA | 4 ppt | 10.1 | – |
| PFOS | 4 ppt | 17 | – |
| PFPeA | 3 ppt | 14.5 | – |
| 11Cl-PF3OUdS | 5 ppt | < 5 | – |
| 4:2 FTS | 3 ppt | < 3 | – |
| 6:2 FTS | 5 ppt | < 5 | – |
| 8:2 FTS | 5 ppt | < 5 | – |
| 9Cl-PF3ONS | 2 ppt | < 2 | – |
| ADONA | 3 ppt | < 3 | – |
| HFPO-DA | 5 ppt | < 5 | – |
| NEtFOSAA | 5 ppt | – | < 5 |
| NFDHA | 20 ppt | < 20 | – |
| NMeFOSAA | 6 ppt | – | < 6 |
| PFDA | 3 ppt | < 3 | – |
| PFDoA | 3 ppt | < 3 | – |
| PFEESA | 3 ppt | < 3 | – |
| PFHpS | 3 ppt | < 3 | – |
| PFMBA | 3 ppt | < 3 | – |
| PFMPA | 4 ppt | < 4 | – |
| PFNA | 4 ppt | < 4 | – |
| PFPeS | 4 ppt | < 4 | – |
| PFTA | 8 ppt | – | < 8 |
| PFTrDA | 7 ppt | – | < 7 |
| PFUnA | 2 ppt | < 2 | – |
| lithium | 9 µg/L | < 9 | – |
N. Richland Slow Sand Filter Facility facility 00004 · sample point S04 · surface water
| Compound | MRL | 2023-03-23 SE1 | 2023-05-02 SE1 | 2023-06-21 SE2 | 2023-09-06 SE3 | 2023-12-04 SE4 |
|---|---|---|---|---|---|---|
| 11Cl-PF3OUdS | 5 ppt | < 5 | – | < 5 | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | – | < 5 | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | – | < 5 | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | – | < 2 | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | – | < 5 | < 5 | < 5 |
| NEtFOSAA | 5 ppt | – | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | – | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | – | < 6 | < 6 | < 6 | < 6 |
| PFBA | 5 ppt | < 5 | – | < 5 | < 5 | < 5 |
| PFBS | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFDA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFHxA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFHxS | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | – | < 4 | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | – | < 4 | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | – | < 4 | < 4 | < 4 |
| PFOS | 4 ppt | < 4 | – | < 4 | < 4 | < 4 |
| PFPeA | 3 ppt | < 3 | – | < 3 | < 3 | < 3 |
| PFPeS | 4 ppt | < 4 | – | < 4 | < 4 | < 4 |
| PFTA | 8 ppt | – | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | – | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | – | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | – | < 9 | < 9 | < 9 |
WLSN WY/S12-15 facility 00002 · sample point S02 · groundwater
| Compound | MRL | 2023-03-13 SE1 |
|---|---|---|
| PFBS | 3 ppt | 6.1 |
| PFHxA | 3 ppt | 6.6 |
| PFHxS | 3 ppt | 5.4 |
| PFOA | 4 ppt | 4.8 |
| PFOS | 4 ppt | 5 |
| PFPeA | 3 ppt | 7.4 |
| 11Cl-PF3OUdS | 5 ppt | < 5 |
| 4:2 FTS | 3 ppt | < 3 |
| 6:2 FTS | 5 ppt | < 5 |
| 8:2 FTS | 5 ppt | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 |
| ADONA | 3 ppt | < 3 |
| HFPO-DA | 5 ppt | < 5 |
| NEtFOSAA | 5 ppt | < 5 |
| NFDHA | 20 ppt | < 20 |
| NMeFOSAA | 6 ppt | < 6 |
| PFBA | 5 ppt | < 5 |
| PFDA | 3 ppt | < 3 |
| PFDoA | 3 ppt | < 3 |
| PFEESA | 3 ppt | < 3 |
| PFHpA | 3 ppt | < 3 |
| PFHpS | 3 ppt | < 3 |
| PFMBA | 3 ppt | < 3 |
| PFMPA | 4 ppt | < 4 |
| PFNA | 4 ppt | < 4 |
| PFPeS | 4 ppt | < 4 |
| PFTA | 8 ppt | < 8 |
| PFTrDA | 7 ppt | < 7 |
| PFUnA | 2 ppt | < 2 |
| lithium | 9 µg/L | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 10 | 20% | 8.9 2023-03-27 | 1.5–3.9 | <MRL | <MRL | 6.1 | 8.9 |
| PFHxA | 10 | 20% | 11.6 2023-03-27 | 1.82–4.22 | <MRL | <MRL | 6.6 | 11.6 |
| PFHxS | 10 | 20% | 5.4 2023-03-13 | 1.03–3.43 | <MRL | <MRL | 4.9 | 5.4 |
| PFOA | 10 | 20% | 10.1 2023-03-27 | 1.49–4.69 | <MRL | <MRL | 4.8 | 10.1 |
| PFOS | 10 | 20% | 17 2023-03-27 | 2.2–5.4 | <MRL | <MRL | 5 | 17 |
| PFPeA | 10 | 20% | 14.5 2023-03-27 | 2.19–4.59 | <MRL | <MRL | 7.4 | 14.5 |
| PFBA | 10 | 10% | 6.6 2023-03-27 | 0.66–5.16 | <MRL | <MRL | <MRL | 6.6 |
| PFHpA | 10 | 10% | 5.8 2023-03-27 | 0.58–3.28 | <MRL | <MRL | <MRL | 5.8 |
Never detected (22): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, PFNA, PFPeS, PFTA, PFTrDA, PFUnA, lithium.
Left-censored Kaplan–Meier statistics (Helsel 2005; Helsel & Lee 2006, NADA for R). Units: ppt; lithium µg/L. Each compound has one reporting limit, so the Kaplan–Meier mean equals the upper mean bound (non-detects at the MRL); the lower bound sets non-detects to 0. “<MRL” = the percentile falls below the reporting limit and cannot be estimated. These describe this system's UCMR 5 samples, not population estimates.
Sources
- EPA UCMR 5 occurrence data text files (UCMR5_All.txt; samples 2023-01-23 to 2026-05-19; data summary dated Jul 2026)
- EPA SDWIS via ECHO SDWA downloads, quarter 2026Q3
- EPA Public Water System Service Areas v3 (Mar 2026)
- US Census Bureau cartographic boundary counties 1:500k, 2024
- EPA/USGS NHDPlus V2 (medium resolution) flowlines, Strahler order 2+
Data build 0fe9c0996add · 2026-10-18T04:09Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.