No health-based violations on EPA record since 2016.
Serves about 17,148 people (5,719 connections) with groundwater from its own wells, and buys water from Dover Water Department.
From EPA's record for DE0000004. PurityMap is independent of Garrison Lake Pump District.
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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 February 2025 to August 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 16.6 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 | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| 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 | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| 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 | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| 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 | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| 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 | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| 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 | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| 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 | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-05 to 2025-08-05 | UCMR5 Analytical Results: GARRISON LAKE PUMP DISTRICT (DE0000004) |
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, Garrison Lake Pump District uses groundwater from its own wells, and buys water from Dover 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 Garrison Lake Pump District's latest lead and copper round, which ended in December 2026, was 0.62 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Garrison Lake Pump District. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.