No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting April 2025.
Serves about 9,000 people (2,811 connections) with groundwater from its own wells.
From EPA's record for ID4010022. PurityMap is independent of Capitol Water Corp.
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3 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From April 2025 | Uranium | 31 µg/L | 30 µg/L | Archived |
| From January 2025 | Uranium | 31 µg/L | 30 µg/L | Archived |
| From October 2024 | Lead and copper rule revisions | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from June 2023 to October 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorononanoic acid (PFNA) | 51 ng/L | 10 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorooctanesulfonic acid (PFOS) | 9.8 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Lithium | 24 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2023-06-09 to 2023-12-06 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorooctanoic acid (PFOA) | 5.9 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorohexanesulfonic acid (PFHxS) | 5.5 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorobutanesulfonic acid (PFBS) | 4 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorohexanoic acid (PFHxA) | 5.2 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoropentanoic acid (PFPeA) | 5.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-06 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-06 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-06 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2023-12-06 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-12 to 2024-10-08 | UCMR5 Analytical Results: CAPITOL WATER CORP (ID4010022) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Capitol Water Corp's phone number on EPA record is 208-375-0931. Its mailing address is 2626 ELDORADO, BOISE, ID 83704.
According to EPA's record, Capitol Water Corp uses groundwater from its own wells.
EPA's record shows 3 health-based violations for Capitol Water Corp in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting April 2025. EPA also lists 123 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Capitol Water Corp's latest lead and copper round, which ended in December 2023. The federal action level is 15 µg/L.
PurityMap has no verified website for Capitol Water Corp. Its phone number on EPA record is 208-375-0931. Its mailing address on EPA record is 2626 ELDORADO, BOISE, ID 83704. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.