- PWSID
- CA1910211
- State
- California
- System type
- community water system (CWS)
- Population served
- 72,472
- City
- Downey
- Counties
- Los Angeles County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2023-08-03 to 2024-05-16 · 7 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 California map · All California 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.
Water purchased from
- Gswc - Norwalk (CA1910098)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 · detected: PFBA;PFHxA;PFPeA - Bellflower - Somerset Mwc (CA1910013)
Seller's highest results: PFOA <MRL · PFOS 17 ppt · HI 0.51 · detected: PFHxS;PFOS - Metropolitan Water Dist. Of So. Cal. (CA1910087)
Seller not monitored under UCMR 5.
Seller results are the seller's own entry-point samples, not measurements of this system's water. This system's own samples (below) may reflect purchased water, its own sources, or both.
Compared with EPA's 2024 values
| Highest single result | Worst entry-point average* | Limit | |
|---|---|---|---|
| PFOA (ppt) | 16 | 15.5 | 4 |
| PFOS (ppt) | 59 | 55 | 4 |
| Hazard Index | 1.103 | 1.053 | 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 California guidance levels
| Highest single result | Worst entry-point average* | California | |
|---|---|---|---|
| PFHxS (ppt) | 11 | 10.5 | 3 (guidance) |
| PFOA (ppt) | 16 | 15.5 | 4 (guidance) |
| PFOS (ppt) | 59 | 55 | 4 (guidance) |
| PFBS (ppt) | 8.9 | 8.15 | 500 (guidance) |
| PFHxA (ppt) | 10 | 9.7 | 1,000 (guidance) |
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 2023-08-03 to 2024-05-16 · 7 entry point(s) · water types: GW;SW · 22 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-08-03 | MWD Intertie CB-26 (SW) | SE1 | <4 | <4 | 0 | lithium 28.9 µg/L |
| 2023-08-03 | MWD Intertie CB-27 (SW) | SE1 | <4 | <4 | 0 | lithium 30.1 µg/L |
| 2023-08-03 | MWD Intertie CB-53 (SW) | SE1 | <4 | <4 | 0 | lithium 29.9 µg/L |
| 2023-08-03 | Well 28B (GW) | SE1 | 13 | 51 | 0.882 | PFBA 7.8, PFHxA 3.3, PFPeA 3.7 |
| 2023-08-03 | Well 40D (GW) | SE1 | <4 | 24 | 0.6 | none |
| 2023-08-03 | Well 41A (GW) | SE1 | 15 | 40 | 0.744 | PFBA 7.9, PFHpA 3.3, PFHxA 9.4, PFPeA 11 |
| 2023-08-03 | Well 46C (GW) | SE1 | 15 | 48 | 1.002 | PFBA 7, PFHpA 3, PFHxA 4.3, PFPeA 4.6 |
| 2023-11-06 | MWD Intertie CB-26 (SW) | SE2 | <4 | <4 | 0 | lithium 51.2 µg/L |
| 2023-11-06 | MWD Intertie CB-27 (SW) | SE2 | <4 | <4 | 0 | lithium 50.1 µg/L |
| 2023-11-06 | MWD Intertie CB-53 (SW) | SE2 | <4 | <4 | 0 | lithium 46 µg/L |
| 2023-11-27 | MWD Intertie CB-27 (SW) | SE2 | n/a | n/a | n/a | none |
| 2023-11-27 | MWD Intertie CB-53 (SW) | SE2 | n/a | n/a | n/a | none |
| 2024-02-14 | MWD Intertie CB-26 (SW) | SE3 | <4 | <4 | 0 | lithium 71.2 µg/L |
| 2024-02-14 | MWD Intertie CB-27 (SW) | SE3 | <4 | <4 | 0 | lithium 68.6 µg/L |
| 2024-02-14 | MWD Intertie CB-53 (SW) | SE3 | <4 | <4 | 0 | lithium 70.5 µg/L |
| 2024-02-14 | Well 28B (GW) | SE2 | 15 | 59 | 0.973 | PFBA 8.7, PFHxA 4.8, PFPeA 4.8 |
| 2024-02-14 | Well 40D (GW) | SE2 | <4 | 29 | 0.65 | none |
| 2024-02-14 | Well 41A (GW) | SE2 | 15 | 43 | 0.734 | PFBA 8.3, PFHpA 3.9, PFHxA 10, PFPeA 17 |
| 2024-02-14 | Well 46C (GW) | SE2 | 16 | 51 | 1.103 | PFBA 7.5, PFHpA 3.7, PFHxA 5.3, PFPeA 7.6 |
| 2024-05-16 | MWD Intertie CB-26 (SW) | SE4 | <4 | <4 | 0 | lithium 87.6 µg/L |
| 2024-05-16 | MWD Intertie CB-27 (SW) | SE4 | <4 | <4 | 0 | lithium 88.6 µg/L |
| 2024-05-16 | MWD Intertie CB-53 (SW) | SE4 | <4 | <4 | 0 | lithium 88.1 µg/L |
“<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
600 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.
MWD Intertie CB-26 facility 91034 · sample point 1910211034 · surface water
| Compound | MRL | 2023-08-03 SE1 | 2023-11-06 SE2 | 2024-02-14 SE3 | 2024-05-16 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 | 28.9 | 51.2 | 71.2 | 87.6 |
MWD Intertie CB-27 facility 91035 · sample point 190211035 · surface water
| Compound | MRL | 2023-08-03 SE1 | 2023-11-06 SE2 | 2023-11-27 SE2 | 2024-02-14 SE3 | 2024-05-16 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 | 30.1 | 50.1 | – | 68.6 | 88.6 |
MWD Intertie CB-53 facility 91036 · sample point 1910211036 · surface water
| Compound | MRL | 2023-08-03 SE1 | 2023-11-06 SE2 | 2023-11-27 SE2 | 2024-02-14 SE3 | 2024-05-16 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 | 29.9 | 46 | – | 70.5 | 88.1 |
Well 28B facility 91807 · sample point 1910211807 · groundwater
| Compound | MRL | 2023-08-03 SE1 | 2024-02-14 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 7.8 | 8.7 |
| PFBS | 3 ppt | 4.7 | 5.6 |
| PFHxA | 3 ppt | 3.3 | 4.8 |
| PFHxS | 3 ppt | 8.8 | 9.7 |
| PFOA | 4 ppt | 13 | 15 |
| PFOS | 4 ppt | 51 | 59 |
| PFPeA | 3 ppt | 3.7 | 4.8 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 |
Well 40D facility 91805 · sample point 1910211805 · groundwater
| Compound | MRL | 2023-08-03 SE1 | 2024-02-14 SE2 |
|---|---|---|---|
| PFHxS | 3 ppt | 6 | 6.5 |
| PFOS | 4 ppt | 24 | 29 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFBA | 5 ppt | < 5 | < 5 |
| PFBS | 3 ppt | < 3 | < 3 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 |
| PFHxA | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 |
| PFPeA | 3 ppt | < 3 | < 3 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 |
Well 41A facility 91804 · sample point 1910211804 · groundwater
| Compound | MRL | 2023-08-03 SE1 | 2024-02-14 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 7.9 | 8.3 |
| PFBS | 3 ppt | 7.4 | 8.9 |
| PFHpA | 3 ppt | 3.3 | 3.9 |
| PFHxA | 3 ppt | 9.4 | 10 |
| PFHxS | 3 ppt | 7.4 | 7.3 |
| PFOA | 4 ppt | 15 | 15 |
| PFOS | 4 ppt | 40 | 43 |
| PFPeA | 3 ppt | 11 | 17 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 |
Well 46C facility 91803 · sample point 1910211803 · groundwater
| Compound | MRL | 2023-08-03 SE1 | 2024-02-14 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 7 | 7.5 |
| PFBS | 3 ppt | 4.6 | 5.7 |
| PFHpA | 3 ppt | 3 | 3.7 |
| PFHxA | 3 ppt | 4.3 | 5.3 |
| PFHxS | 3 ppt | 10 | 11 |
| PFOA | 4 ppt | 15 | 16 |
| PFOS | 4 ppt | 48 | 51 |
| PFPeA | 3 ppt | 4.6 | 7.6 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 |
| PFDA | 3 ppt | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 20 | 60% | 88.6 2024-05-16 | 35.54–39.14 | 29.9 | 68.6 | 87.6 | 88.1 |
| PFHxS | 20 | 40% | 11 2024-02-14 | 3.33–5.13 | <MRL | 7.3 | 9.7 | 10 |
| PFOS | 20 | 40% | 59 2024-02-14 | 17.25–19.65 | <MRL | 40 | 51 | 51 |
| PFBA | 20 | 30% | 8.7 2024-02-14 | 2.36–5.86 | <MRL | 7 | 7.9 | 8.3 |
| PFBS | 20 | 30% | 8.9 2024-02-14 | 1.84–3.94 | <MRL | 4.6 | 5.7 | 7.4 |
| PFHxA | 20 | 30% | 10 2024-02-14 | 1.85–3.96 | <MRL | 3.3 | 5.3 | 9.4 |
| PFOA | 20 | 30% | 16 2024-02-14 | 4.45–7.25 | <MRL | 13 | 15 | 15 |
| PFPeA | 20 | 30% | 17 2024-02-14 | 2.44–4.54 | <MRL | 3.7 | 7.6 | 11 |
| PFHpA | 20 | 20% | 3.9 2024-02-14 | 0.69–3.1 | <MRL | <MRL | 3.3 | 3.7 |
Never detected (21): 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.
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 2023-01-09 to 2026-06-17; 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 90f0922cd84f · 2026-10-18T04:12Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.