Cheyenne Board of Public Utilities water quality
Cheyenne, WY · serves 64,165 people (25,386 connections) · Surface water · Local government · EPA ID WY5600011
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data. Some contaminants were detected below the limits.
- PFAS
- Not detectedNone of 29 PFAS found above EPA's reporting limits in 8 samples (2023–2025).
- Lead
- Near 2027 action level15 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2025. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Want to reduce what was found? Filters for these results.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Cheyenne Board of Public Utilities's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (307) 632-9890. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 2 entry points tested Oct 2023 to Jul 2024. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
29 PFAS tested, 0 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 1 of 8 samples. Highest result 9.56 ppb. EPA's non-enforceable screening level is 10 ppb. Below screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 15 ppb lead (Jan 2025 – Dec 2025). Near 2027 action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2025 – Dec 2025 | 15 ppb |
| Jan 2024 – Dec 2024 | 9 ppb |
| Jan 2023 – Dec 2023 | 10 ppb |
Earlier results (9)
| Jul 2022 – Dec 2022 | 4 ppb |
| Jan 2022 – Jun 2022 | 4 ppb |
| Jul 2021 – Dec 2021 | 1.8 ppb |
| Jan 2021 – Jun 2021 | 4 ppb |
| Jan 2018 – Dec 2020 | 3 ppb |
| Jan 2015 – Dec 2017 | 3.3 ppb |
| Jan 2012 – Dec 2014 | 6 ppb |
| Jan 2009 – Dec 2011 | 3.9 ppb |
| Jan 2006 – Dec 2008 | 6 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 53.1 ppb | 300 ppb |
| Chlorate | 59 ppb | 210 ppb |
| Vanadium | 2.1 ppb | 21 ppb |
| Chromium-6 | 0.13 ppb | – |
| Strontium | 0.2 ppm | 1.5 ppm |
Where it serves
ZIP codes the system reported serving: 82001, 82003, 82007, 82009
Nearby utilities
- City of Casper Casper · 142 mi
- City of Riverton Riverton · 228 mi · PFAS above limit
Questions
Is Cheyenne Board of Public Utilities water safe to drink?
Cheyenne Board of Public Utilities has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Cheyenne Board of Public Utilities water have PFAS?
EPA tested Cheyenne Board of Public Utilities for 29 PFAS between Oct 2023 and Jul 2024 and none were detected above the reporting limits (about 2 to 20 ppt depending on the chemical).
What is the lead level in Cheyenne Board of Public Utilities water?
The most recent 90th-percentile lead result for Cheyenne Board of Public Utilities is 15 ppb, for the period ending Dec 2025. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for WY5600011: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID WY5600011).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Cheyenne Board of Public Utilities at (307) 632-9890, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.