- PWSID
- ID4010022
- State
- Idaho
- System type
- community water system (CWS)
- Population served
- 9,000
- City
- Boise
- Counties
- Ada County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-06-09 to 2024-10-08 · 4 entry point(s) · water types: GW
- Service-area boundary
- EPA-modeled (Random Forest) — approximate: estimated by EPA with a statistical model, not a surveyed service area
Hazard Index ≥ 3 × its limit highest single result
Hazard Index ≥ 3 × its limit worst entry-point average
Open on the Idaho map · All Idaho 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) | 5.9 | 5.8 | 4 |
| PFOS (ppt) | 9.8 | 9.45 | 4 |
| Hazard Index | 5.61 | 4.005 | 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).
No Idaho PFAS drinking-water standard in effect or proposed as of 2026-10-17: No Idaho-specific PFAS drinking-water standard; Idaho adopts only final national primary drinking water standards (DEQ PFAS and Idaho Drinking Water page, updated 2026-09-29).
Sampling history
Sampled 2023-06-09 to 2024-10-08 · 4 entry point(s) · water types: GW · 11 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-06-09 | CAPITOL WATER CORP (GW) | SE1 | n/a | n/a | n/a | lithium 14 µg/L |
| 2023-06-09 | CAPITOL WATER CORP (GW) | SE1 | n/a | n/a | n/a | lithium 16 µg/L |
| 2023-06-12 | CAPITOL WATER CORP (GW) | SE1 | <4 | <4 | 0 | lithium 24 µg/L |
| 2023-06-12 | CAPITOL WATER CORP (GW) | SE1 | <4 | <4 | 2.4 | lithium 17 µg/L |
| 2023-08-08 | CAPITOL WATER CORP (GW) | SE1 | 5.9 | 9.1 | 0.952 | PFHxA 4.6, PFPeA 4.8 |
| 2023-08-08 | CAPITOL WATER CORP (GW) | SE1 | <4 | 4.1 | 0.55 | none |
| 2023-12-06 | CAPITOL WATER CORP (GW) | SE2 | <4 | <4 | 5.61 | lithium 19 µg/L |
| 2023-12-06 | CAPITOL WATER CORP (GW) | SE2 | 5.7 | 9.8 | 1.042 | PFHxA 5.2, PFPeA 5.4, lithium 15 µg/L |
| 2023-12-06 | CAPITOL WATER CORP (GW) | SE2 | <4 | 4.4 | 0.45 | lithium 16 µg/L |
| 2023-12-06 | CAPITOL WATER CORP (GW) | SE2 | n/a | n/a | n/a | lithium 15 µg/L |
| 2024-10-08 | CAPITOL WATER CORP (GW) | SE2 | <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
240 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.
CAPITOL WATER CORP facility A0003805 · sample point WELL4 · groundwater
| Compound | MRL | 2023-06-12 SE1 | 2023-12-06 SE2 | 2024-10-08 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 | 24 | 15 | – |
CAPITOL WATER CORP facility A0003810 · sample point WELL3 · groundwater
| Compound | MRL | 2023-06-12 SE1 | 2023-12-06 SE2 |
|---|---|---|---|
| PFHxS | 3 ppt | < 3 | 5.1 |
| PFNA | 4 ppt | 24 | 51 |
| 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 |
| 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 | 17 | 19 |
CAPITOL WATER CORP facility D0001888 · sample point WELL7 · groundwater
| Compound | MRL | 2023-06-09 SE1 | 2023-08-08 SE1 | 2023-12-06 SE2 |
|---|---|---|---|---|
| PFBS | 3 ppt | – | 4 | 3.9 |
| PFHxA | 3 ppt | – | 4.6 | 5.2 |
| PFHxS | 3 ppt | – | 4.6 | 3.9 |
| PFNA | 4 ppt | – | 4.9 | 6.5 |
| PFOA | 4 ppt | – | 5.9 | 5.7 |
| PFOS | 4 ppt | – | 9.1 | 9.8 |
| PFPeA | 3 ppt | – | 4.8 | 5.4 |
| 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 |
| PFHpA | 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 | 14 | – | 15 |
CAPITOL WATER CORP facility E0008319 · sample point WELL5NEW · groundwater
| Compound | MRL | 2023-06-09 SE1 | 2023-08-08 SE1 | 2023-12-06 SE2 |
|---|---|---|---|---|
| PFHxS | 3 ppt | – | 5.5 | 4.5 |
| PFOS | 4 ppt | – | 4.1 | 4.4 |
| 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 | 16 | – | 16 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 8 | 100% | 24 2023-06-12 | 17–17 | 16 | 17 | 24 | 24 |
| PFHxS | 8 | 62% | 5.5 2023-08-08 | 2.95–4.08 | 3.9 | 4.6 | 5.5 | 5.5 |
| PFNA | 8 | 50% | 51 2023-12-06 | 10.8–12.8 | <MRL | 6.5 | 51 | 51 |
| PFOS | 8 | 50% | 9.8 2023-12-06 | 3.42–5.42 | <MRL | 4.4 | 9.8 | 9.8 |
| PFBS | 8 | 25% | 4 2023-08-08 | 0.99–3.24 | <MRL | <MRL | 4 | 4 |
| PFHxA | 8 | 25% | 5.2 2023-12-06 | 1.23–3.48 | <MRL | <MRL | 5.2 | 5.2 |
| PFOA | 8 | 25% | 5.9 2023-08-08 | 1.45–4.45 | <MRL | <MRL | 5.9 | 5.9 |
| PFPeA | 8 | 25% | 5.4 2023-12-06 | 1.27–3.52 | <MRL | <MRL | 5.4 | 5.4 |
Never detected (22): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFBA, PFDA, PFDoA, PFEESA, PFHpA, 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 2023-01-17 to 2026-03-03; 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 cfc4eb4a204c · 2026-10-18T04:05Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.