- PWSID
- CA3010010
- State
- California
- System type
- community water system (CWS)
- Population served
- 140,054
- City
- Fullerton
- Counties
- Orange County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2023-03-14 to 2026-04-27 · 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
- Suburban Water Systems-La Mirada (CA1910059)
Seller's highest results: PFOA 7 ppt · PFOS 16 ppt · HI 0.382 · detected: PFBA;PFBS;PFHxS;PFOA;PFOS;PFPeA - City Of Brea (CA3010002)
Seller's highest results: PFOA <MRL · PFOS <MRL · HI 0 - City Of Anaheim (CA3010001)
Seller's highest results: PFOA 10.1 ppt · PFOS 29 ppt · HI 1.09 · detected: PFBA;PFBS;PFHxA;PFHxS;PFOA;PFOS;PFPeA - Golden State Wc - Placentia/Yorba Linda (CA3010035)
Seller's highest results: PFOA 6 ppt · PFOS 6.5 ppt · HI 0.363 · detected: PFBA;PFBS;PFHxA;PFHxS;PFOA;PFOS;PFPeA - 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) | 10.8 | 10.8 | 4 |
| PFOS (ppt) | 13.3 | 13.3 | 4 |
| Hazard Index | 0.623 | 0.623 | 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) | 6.2 | 6.2 | 3 (guidance) |
| PFOA (ppt) | 10.8 | 10.8 | 4 (guidance) |
| PFOS (ppt) | 13.3 | 13.3 | 4 (guidance) |
| PFBS (ppt) | 7.6 | 7.25 | 500 (guidance) |
| PFHxA (ppt) | 12.4 | 11.8 | 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 2023-03-14 to 2026-04-27 · 7 entry point(s) · water types: GW;SW · 19 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-03-14 | MWD Intertie 1 (SW) | SE1 | n/a | n/a | n/a | none |
| 2023-03-29 | MWD Intertie 1 (SW) | SE1 | <4 | <4 | 0 | none |
| 2023-06-21 | MWD Intertie 1 (SW) | SE2 | <4 | <4 | 0 | lithium 19.68 µg/L |
| 2023-09-13 | MWD Intertie 1 (SW) | SE3 | <4 | <4 | 0 | lithium 34.98 µg/L |
| 2023-12-06 | MWD Intertie 1 (SW) | SE4 | <4 | <4 | 0 | lithium 30.56 µg/L |
| 2024-08-26 | Airport Well 9 (GW) | SE1 | <4 | <4 | 0 | lithium 22.87 µg/L |
| 2024-08-26 | Fullerton Main PFAS Treatment Facility (GW) | SE1 | <4 | <4 | 0 | none |
| 2024-08-26 | Kimberly 1A Well Treatment Finished Water (GW) | SE1 | <4 | <4 | 0 | PFHxA 4.8, PFPeA 7.6 |
| 2024-08-26 | Main Plant (GW) | SE1 | 10.8 | 13.3 | 0.623 | PFBA 5.2, PFHpA 4.2, PFHxA 11.1, PFPeA 12.3 |
| 2024-08-26 | Sunclipse 10 (GW) | SE1 | 10.1 | 12.5 | 0.533 | PFBA 5.9, PFHpA 4.3, PFHxA 12.4, PFPeA 12.7 |
| 2025-02-25 | Airport Well 9 (GW) | SE2 | <4 | <4 | 0 | lithium 23.01 µg/L |
| 2025-02-25 | Kimberly 1A Well Treatment Finished Water (GW) | SE2 | <4 | <4 | 0 | none |
| 2025-02-25 | Sunclipse 10 (GW) | SE2 | 10.2 | 11.9 | 0.524 | PFBA 5.9, PFHpA 4.8, PFHxA 11.2, PFPeA 13.2 |
| 2025-02-26 | Fullerton Main PFAS Treatment Facility (GW) | SE2 | <4 | <4 | 0 | none |
| 2025-07-28 | MWD Intertie 3 (SW) | SE1 | <4 | <4 | 0 | none |
| 2025-10-20 | MWD Intertie 3 (SW) | SE2 | n/a | n/a | n/a | lithium 28.14 µg/L |
| 2025-11-12 | MWD Intertie 3 (SW) | SE2 | <4 | <4 | 0 | none |
| 2026-01-27 | MWD Intertie 3 (SW) | SE3 | <4 | <4 | 0 | lithium 35.49 µg/L |
| 2026-04-27 | MWD Intertie 3 (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
505 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.
Airport Well 9 facility 91806 · sample point 3010010806 · groundwater
| Compound | MRL | 2024-08-26 SE1 | 2025-02-25 SE2 |
|---|---|---|---|
| 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 |
| PFHxS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 |
| PFOS | 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 | 22.8723 | 23.0053 |
Fullerton Main PFAS Treatment Facility facility 91813 · sample point 3010010813 · groundwater
| Compound | MRL | 2024-08-26 SE1 | 2025-02-26 SE2 |
|---|---|---|---|
| 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 |
| PFHxS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 |
| PFOS | 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 |
Kimberly 1A Well Treatment Finished Water facility 91812 · sample point 3010010812 · groundwater
| Compound | MRL | 2024-08-26 SE1 | 2025-02-25 SE2 |
|---|---|---|---|
| PFHxA | 3 ppt | 4.8 | < 3 |
| PFPeA | 3 ppt | 7.6 | < 3 |
| 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 |
| PFHxS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 |
| PFOS | 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 |
MWD Intertie 1 facility 91811 · sample point 3010010811 · surface water
| Compound | MRL | 2023-03-14 SE1 | 2023-03-29 SE1 | 2023-06-21 SE2 | 2023-09-13 SE3 | 2023-12-06 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 | – | 19.6837 | 34.9834 | 30.5646 |
MWD Intertie 3 facility 91810 · sample point 3010010810 · surface water
| Compound | MRL | 2025-07-28 SE1 | 2025-10-20 SE2 | 2025-11-12 SE2 | 2026-01-27 SE3 | 2026-04-27 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 |
| NFDHA | 20 ppt | < 20 | – | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | – | < 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 |
| PFTrDA | 7 ppt | – | < 7 | – | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | – | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | 28.1434 | – | 35.491 | – |
Main Plant facility 91805 · sample point 3010010805 · groundwater
| Compound | MRL | 2024-08-26 SE1 |
|---|---|---|
| PFBA | 5 ppt | 5.2 |
| PFBS | 3 ppt | 6.6 |
| PFHpA | 3 ppt | 4.2 |
| PFHxA | 3 ppt | 11.1 |
| PFHxS | 3 ppt | 6.2 |
| PFOA | 4 ppt | 10.8 |
| PFOS | 4 ppt | 13.3 |
| PFPeA | 3 ppt | 12.3 |
| 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 |
Sunclipse 10 facility 91803 · sample point 3010010803 · groundwater
| Compound | MRL | 2024-08-26 SE1 | 2025-02-25 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.9 | 5.9 |
| PFBS | 3 ppt | 6.9 | 7.6 |
| PFHpA | 3 ppt | 4.3 | 4.8 |
| PFHxA | 3 ppt | 12.4 | 11.2 |
| PFHxS | 3 ppt | 5.3 | 5.2 |
| PFOA | 4 ppt | 10.1 | 10.2 |
| PFOS | 4 ppt | 12.5 | 11.9 |
| PFPeA | 3 ppt | 12.7 | 13.2 |
| 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 | 16 | 44% | 35.49 2026-01-27 | 12.17–17.23 | <MRL | 23.01 | 34.98 | 35.49 |
| PFHxA | 17 | 24% | 12.4 2024-08-26 | 2.32–4.62 | <MRL | <MRL | 11.2 | 12.4 |
| PFPeA | 17 | 24% | 13.2 2025-02-25 | 2.69–4.99 | <MRL | <MRL | 12.7 | 13.2 |
| PFBA | 17 | 18% | 5.9 2024-08-26 | 1–5.12 | <MRL | <MRL | 5.9 | 5.9 |
| PFBS | 17 | 18% | 7.6 2025-02-25 | 1.24–3.71 | <MRL | <MRL | 6.9 | 7.6 |
| PFHpA | 17 | 18% | 4.8 2025-02-25 | 0.78–3.25 | <MRL | <MRL | 4.3 | 4.8 |
| PFHxS | 17 | 18% | 6.2 2024-08-26 | 0.98–3.45 | <MRL | <MRL | 5.3 | 6.2 |
| PFOA | 17 | 18% | 10.8 2024-08-26 | 1.83–5.12 | <MRL | <MRL | 10.2 | 10.8 |
| PFOS | 17 | 18% | 13.3 2024-08-26 | 2.22–5.51 | <MRL | <MRL | 12.5 | 13.3 |
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.