No health-based violations on EPA record since 2016.
Serves about 4,643 people (1,865 connections) with groundwater from its own wells, and buys water from Lacey Water Department.
From EPA's record for WA5366578. PurityMap is independent of Pattison 500.
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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 April 2025 to October 2025.
| 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 | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| 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 | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| 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 | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| 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 | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| 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 | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| 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 | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| 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 | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-20 to 2025-10-19 | UCMR5 Analytical Results: PATTISON 500 (WA5366578) |
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 →According to EPA's record, Pattison 500 uses groundwater from its own wells, and buys water from Lacey Water Department.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Pattison 500's latest lead and copper round, which ended in December 2024, was 3.1 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Pattison 500. Its mailing address on EPA record is 1230 Ruddell Rd SE, Lacey, WA 98503. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.