No health-based violations on EPA record since 2016.
Serves about 8,720 people (2,104 connections) with groundwater from its own wells, and buys water from City of Redmond, Sammamish Plateau Water & Sewer and Ne Sammamish Sewer & Water District.
From EPA's record for WA5390260. PurityMap is independent of Union Hill Water Association Inc.
Are you this utility? Correct this listing →
No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2023 to October 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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 | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| 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 | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| 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 | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| 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 | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| 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 | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-21 to 2023-10-10 | UCMR5 Analytical Results: UNION HILL WATER ASSOCIATION INC (WA5390260) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
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 →According to EPA's record, Union Hill Water Association Inc uses groundwater from its own wells, and buys water from City of Redmond, Sammamish Plateau Water & Sewer and Ne Sammamish Sewer & Water District.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Union Hill Water Association Inc's latest lead and copper round, which ended in December 2025, was 5.8 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Union Hill Water Association Inc. Its mailing address on EPA record is 5020 236th Ave NE, Redmond, WA 98053. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.