- PWSID
- RI1858422
- State
- Rhode Island
- System type
- community water system (CWS)
- Population served
- 19,354
- City
- Kingston
- Counties
- Washington County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-08-17 to 2024-03-05 · 1 entry point(s) · water types: GW
- Service-area boundary
- authoritative
PFOA ≥ 3 × its limit highest single result
PFOA ≥ 3 × its limit worst entry-point average
Open on the Rhode Island map · All Rhode Island 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
- Kingston Water District (RI1858421)
Seller's highest results: PFOA 6.2 ppt · PFOS <MRL · HI 0.018 · detected: PFBS;PFHpA;PFHxA;PFOA;PFPeA
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 | 16 | 4 |
| PFOS (ppt) | 5 | 4.5 | 4 |
| Hazard Index | 1.103 | 0.904 | 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 Rhode Island standards
| Highest single result | Worst entry-point average* | Rhode Island | |
|---|---|---|---|
| PFAS6 (sum) (ppt) | 38 | 35.5 | 20 |
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 2023-08-17 to 2024-03-05 · 1 entry point(s) · water types: GW · 3 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-08-17 | Wells #2 - #4 Treatment Plant (GW) | SE1 | 16 | 4 | 0.705 | PFHpA 6, PFHxA 8, PFPeA 7, lithium 9.99 µg/L |
| 2024-02-14 | Wells #2 - #4 Treatment Plant (GW) | SE2 | 16 | 5 | 1.103 | PFHpA 6, PFHxA 8, PFPeA 7, lithium 11.5 µg/L |
| 2024-03-05 | Wells #2 - #4 Treatment Plant (GW) | SE2 | n/a | n/a | n/a | 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
60 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.
Wells #2 - #4 Treatment Plant facility 20005 · sample point EP0005 · groundwater
| Compound | MRL | 2023-08-17 SE1 | 2024-02-14 SE2 | 2024-03-05 SE2 |
|---|---|---|---|---|
| PFBS | 3 ppt | 9 | 7 | – |
| PFHpA | 3 ppt | 6 | 6 | – |
| PFHxA | 3 ppt | 8 | 8 | – |
| PFHxS | 3 ppt | 3 | 4 | – |
| PFNA | 4 ppt | 4 | 7 | – |
| PFOA | 4 ppt | 16 | 16 | – |
| PFOS | 4 ppt | 4 | 5 | – |
| PFPeA | 3 ppt | 7 | 7 | – |
| 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 | – |
| 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 | – |
| PFPeS | 4 ppt | < 4 | < 4 | – |
| PFTA | 8 ppt | < 8 | – | < 8 |
| PFTrDA | 7 ppt | < 7 | – | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | – |
| lithium | 9 µg/L | 9.99 | 11.5 | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 2 | 100% | 9 2023-08-17 | 8–8 | fewer than 4 results: raw values only | |||
| PFHpA | 2 | 100% | 6 2023-08-17 | 6–6 | fewer than 4 results: raw values only | |||
| PFHxA | 2 | 100% | 8 2023-08-17 | 8–8 | fewer than 4 results: raw values only | |||
| PFHxS | 2 | 100% | 4 2024-02-14 | 3.5–3.5 | fewer than 4 results: raw values only | |||
| PFNA | 2 | 100% | 7 2024-02-14 | 5.5–5.5 | fewer than 4 results: raw values only | |||
| PFOA | 2 | 100% | 16 2023-08-17 | 16–16 | fewer than 4 results: raw values only | |||
| PFOS | 2 | 100% | 5 2024-02-14 | 4.5–4.5 | fewer than 4 results: raw values only | |||
| PFPeA | 2 | 100% | 7 2023-08-17 | 7–7 | fewer than 4 results: raw values only | |||
| lithium | 2 | 100% | 11.5 2024-02-14 | 10.74–10.74 | fewer than 4 results: raw values only | |||
Never detected (21): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFBA, PFDA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, 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 2023-01-23 to 2025-11-17; 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 ef39d978a9ec · 2026-10-18T04:03Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.