Ynp-Old Faithful
Published drinking-water records and contacts for Ynp-Old Faithful. System WY5680085. Review sources and dates; not a real-time water assessment.
- System ID
- WY5680085
- State or territory
- WY
- Published population served
- 7675
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 120 — 2023-02-27 – 2023-11-20
- Lead and copper monitoring summaries: 17 — 2003-01-01 – 2026-12-31
- Wyoming selected chemical sample panels: 16 — 2026-02-18 – 2026-09-08
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFBA | < 0.005 µg/L | 0.005 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFBS | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFHpA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFHxA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFOA | < 0.004 µg/L | 0.004 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFPeA | < 0.003 µg/L | 0.003 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
| lithium | 74.8 µg/L | 9 µg/L | 2023-11-20 | YNP-OLD FAITHFUL / SP01 |
Download all EPA UCMR 5 records (CSV)
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.002 mg/L | 2026-01-01 – 2026-12-31 | 2026Q3 |
| Lead (PB90) | 0.006 mg/L | 2025-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.004 mg/L | 2024-07-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0.004 mg/L | 2024-01-01 – 2024-06-30 | 2026Q3 |
| Lead (PB90) | 0.125 mg/L | 2021-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0.003 mg/L | 2020-07-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0.001 mg/L | 2020-01-01 – 2020-06-30 | 2026Q3 |
| Lead (PB90) | 0.004 mg/L | 2015-01-01 – 2017-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| ARSENIC | 0.004 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| BARIUM | < 0.05 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| CADMIUM | < 0.001 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| CHROMIUM | < 0.005 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| MERCURY | < 0.0001 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| NICKEL | < 0.01 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| SELENIUM | < 0.001 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| SODIUM | 20 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| ANTIMONY, TOTAL | 0.001 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| BERYLLIUM, TOTAL | < 0.001 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| THALLIUM, TOTAL | < 0.0005 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
| COMBINED URANIUM | < 0.0003 mg/L | 2026-09-08 | SP01 / Wyoming selected chemical sample panels |
State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.
Download state records with source notes (CSV)
Published compliance history
21 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Inorganic Chemicals / Monitoring, Regular | 2025-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Lead and Copper Rule / Initial, Follow-up, or Routine Source Water M/R | 2024-07-01 – — | Resolved | No | 2026Q3 |
| Lead and Copper Rule / OCCT/SOWT Study/Recommendation | 2024-07-01 – — | Resolved | Yes | 2026Q3 |
| Lead and Copper Rule / Public Education | 2024-06-01 – — | Resolved | Yes | 2026Q3 |
| Lead and Copper Rule / Public Education | 2024-03-01 – — | Resolved | Yes | 2026Q3 |
| Lead and Copper Rule / Lead Consumer Notice | 2023-12-30 – — | Resolved | No | 2026Q3 |
| Lead and Copper Rule / Public Education | 2023-11-30 – — | Resolved | Yes | 2026Q3 |
| Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R | 2023-10-01 – — | Resolved | No | 2026Q3 |
| Arsenic Rule / Maximum Contaminant Level Violation, Average | 2023-10-01 – 2023-12-31 | Resolved | Yes | 2026Q3 |
| Arsenic Rule / Maximum Contaminant Level Violation, Average | 2023-07-01 – 2023-09-30 | Resolved | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2023-07-01 – 2023-09-30 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2023-07-01 – 2023-09-30 | Resolved | No | 2026Q3 |
| Arsenic Rule / Maximum Contaminant Level Violation, Average | 2023-04-01 – 2023-06-30 | Resolved | Yes | 2026Q3 |
| Long Term 2 Enhanced Surface Water Treatment Rule / Failure To Address Deficiency | 2022-09-17 – — | Resolved | Yes | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monthly Turbidity Exceed (Enhanced SWTR) | 2022-06-01 – 2022-06-30 | Resolved | Yes | 2026Q3 |
| Surface Water Treatment Rule / Monitoring of Treatment (SWTR-Filter) | 2022-04-01 – 2022-04-30 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-04-01 – 2022-04-30 | Resolved | No | 2026Q3 |
| Arsenic Rule / Maximum Contaminant Level Violation, Average | 2020-01-01 – 2020-03-31 | Resolved | Yes | 2026Q3 |
| Total Coliform Rule / Monitoring, Routine Major (TCR) | 1995-08-01 – 1995-08-31 | Archived | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 1993-10-01 – 1993-12-31 | Archived | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
- Wyoming selected chemical sample panels — last successful check: 2026-10-16
Administrative contact (EPA filing)
Hoffman, Steven: 307-344-9051
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.