Is Cheyenne, WY tap water safe?

Data: U.S. EPA · How we read the data · How we check it

No federal limits exceeded in EPA data for Cheyenne Board of Public Utilities.

15 public water systems serve parts of Cheyenne. The largest, Cheyenne Board of Public Utilities, serves 64,165 people. Your water bill names your system.

Largest system

Cheyenne Board of Public Utilities

64,165 people · Surface water · EPA ID WY5600011

PFAS	Highest average	Limit	Status
PFOA Not detected	–	4 ppt	Not detected
PFOS Not detected	–	4 ppt	Not detected
PFHxS Not detected	–	10 ppt	Not detected
PFNA Not detected	–	10 ppt	Not detected
HFPO-DA (GenX) Not detected	–	10 ppt	Not detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 15 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Near 2027 action level
Health-based violations since 2016: 0

Full Cheyenne Board of Public Utilities results

Across Wyoming, 1 of 32 water systems EPA tested had PFAS above a 2024 federal limit, and 0 systems were above the lead action level in results from the last five years. Wyoming results.

Cheyenne homes and lead pipes

57%

of homes built before 1980 (Wyoming 49%, US 50%)

18%

built before 1950 (Wyoming 15%)

33%

of households rent (Wyoming 28%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Cheyenne city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Cheyenne

South Cheyenne Water & Sewer District
10,000 people · Purchased surface water · Wyoming · lists this city
No PFAS above limits
USAF F.E. Warren AFB
5,500 people · Purchased surface water · Wyoming · lists this city
No PFAS above limits
Winchester Hills Water System
1,078 people · Groundwater · Wyoming · lists this city
Not in EPA's PFAS sample
West Winds Water System
663 people · Purchased surface water · Wyoming · lists this city
Not in EPA's PFAS sample
Big Country Estates Water System
615 people · Purchased surface water · Wyoming · lists this city
Not in EPA's PFAS sample
Cimmaron Village Water System
327 people · Purchased surface water · Wyoming · lists this city
Not in EPA's PFAS sample

8 more systems

Orchard Valley Water Company
260 people · Groundwater · Wyoming · lists this city
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Englewood Village MHP
152 people · Purchased surface water · Wyoming · lists this city
Not in EPA's PFAS sample
Highland Ranch Estates Water System
128 people · Groundwater · Wyoming · lists this city
Not in EPA's PFAS sample
Hide-A-Way Mobile Village Water System
107 people · Groundwater · Wyoming · lists this city
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Mountain View Estates (Knecht Invts) Water System
75 people · Groundwater · Wyoming · lists this city
Coliform bacteria violations
Restway Travel Park Water System
62 people · Groundwater · Wyoming · lists this city
Coliform bacteria violations
Evergreen Mobile Home Park Water System
35 people · Groundwater · Wyoming · lists this city
Coliform bacteria violations
Miller Lower Mobile Home Park Water System
30 people · Groundwater · Wyoming · lists this city
Nitrate-nitrite violation

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Laramie 44 mi City of Laramie	City of Laramie	None above limits	1.28 ppb
Casper 142 mi City of Casper	City of Casper	None above limits	1 ppb
Gillette 220 mi City of Gillette	City of Gillette	None above limits	2 ppb

Cheyenne ZIP codes (1)

82001

Questions

Is Cheyenne tap water safe to drink?

Cheyenne Board of Public Utilities has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Cheyenne, WY?

15 public water systems serve parts of Cheyenne. The largest is Cheyenne Board of Public Utilities (64,165 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Cheyenne tap water have PFAS?

None detected above EPA's reporting limits. Cheyenne Board of Public Utilities had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Cheyenne homes have lead pipes?

Census estimates put 57% of Cheyenne homes as built before 1980 (Wyoming: 49%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Cheyenne Board of Public Utilities's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.