No health-based violations on EPA record since 2016.
Serves about 8,400 people (2,424 connections) with groundwater from its own wells.
From EPA's record for CO0159095. PurityMap is independent of Town of Silverthorne.
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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 |
|---|---|---|---|---|---|
| Lithium | 25 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 | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorohexanesulfonic acid (PFHxS) | 3.7 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorobutanesulfonic acid (PFBS) | 5.9 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 | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| 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 | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| 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 | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| 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 | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| 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 | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| 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 | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-07 to 2025-10-07 | UCMR5 Analytical Results: SILVERTHORNE TOWN OF (CO0159095) |
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 →Town of Silverthorne's phone number on EPA record is 970-262-7344. Its mailing address is PO BOX 1309, SILVERTHORNE, CO 80498.
According to EPA's record, Town of Silverthorne uses groundwater from its own wells.
No health-based violations on EPA record since 2016. EPA also lists 4 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 Town of Silverthorne's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Town of Silverthorne. Its phone number on EPA record is 970-262-7344. Its mailing address on EPA record is PO BOX 1309, SILVERTHORNE, CO 80498. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.