No open health-based violations on EPA record in the last 10 years.
Serves about 5,925 people (683 connections) with groundwater influenced by surface water, from its own wells.
From EPA's record for WY5680079. PurityMap is independent of Ynp.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From May 2019 | Groundwater Rule | – | – | Resolved |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
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.
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Follow this water →According to EPA's record, Ynp uses groundwater influenced by surface water, from its own wells.
EPA's record shows 1 health-based violation for Ynp in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 34 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Ynp's latest lead and copper round, which ended in June 2025, was 11 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Ynp. Its mailing address on EPA record is P.O. Box 168, YELLOWSTONE, WY 82190. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.