Water Service Outages in Wyoming by City
91% of Wyoming's 323 community water systems serve 3,300 people or fewer, so many outages and boil water notices affect a single small town or subdivision.
Wyoming drinking water record
Busiest year: 2024 (65 violations). Counted by the year the violation period began. Source: EPA SDWIS.
- Community water systems: 323 active systems serve about 534,408 people. 294 of them (91%) serve 3,300 people or fewer; 216 draw mainly on groundwater and 98 on surface water.
- Health-based violations since 2015: 378, at 113 systems (35% of all systems). That share is 31st of 50 states (1 = lowest).
- Most common problems: contaminant averages over the limit (180); uncorrected Ground Water Rule deficiencies (111); surface water treatment (15). Source: EPA SDWIS
- Largest system: Cheyenne Board of Public Utilities, about 64,165 people, with 0 health-based violations since 2015. Source: EPA SDWIS
- Housing age: the median Wyoming home was built in 1981 (US 1980). Source: US Census Bureau, ACS 2020–2024 (table B25035)
- Storm damage to water service: NOAA storm narratives mention water mains, boil water notices or lost water service in 1 episodes in Wyoming since 2015. Source: NOAA Storm Events Database
- January 13, 2021, Goshen County (high wind): “At the wastewater treatment plant for the city, the high winds pushed surface ice damaging the debris curtain at the outfall of the finishing lagoon.” Source: NOAA Storm Events Database
| System | People served | Main source | Health violations since 2015 |
|---|---|---|---|
| Cheyenne Board of Public Utilities | 64,165 | Surface water | 0 |
| Casper, City Of | 59,000 | Bought surface water | 0 |
| Laramie, City Of | 32,395 | Surface water | 0 |
| Gillette, City Of | 32,222 | Groundwater | 0 |
| Jackson, Town Of | 24,760 | Groundwater | 0 |
| Rock Springs, City Of | 24,000 | Bought surface water | 0 |
Source: EPA SDWIS.
Wyoming is 3rd of 7 (1 = lowest share). Source: EPA SDWIS.
Checked September 2026.
Who to call in Wyoming, city by city
4 Wyoming cities on this site and the water utility for each. What to do while you wait is in our water service outage guide.
- Cheyenne Cheyenne Board of Public Utilities
- Casper City of Casper Utilities
- Gillette City of Gillette Utilities
- Laramie City of Laramie Water
Frequently asked questions
Is there a water service outage in Wyoming right now?
Not on this site: no reports from Wyoming in the last 24 hours.
How many public water systems are in Wyoming?
EPA records list 323 active community water systems in Wyoming, serving about 534,408 people. 91% serve 3,300 people or fewer.
How common are drinking water violations in Wyoming?
Since 2015, 113 of 323 community water systems in Wyoming (35%) have had at least one health-based violation, 378 in total.
What is the largest water system in Wyoming?
Cheyenne Board of Public Utilities, which EPA records list as serving about 64,165 people.
Report counts are user-submitted; other figures name their official source. How our data works
Cities in Wyoming with Water Service Outages Information
Casper
no reports in the last 24 hours · pop. 59,452
City of Casper Utilities
Cheyenne
no reports in the last 24 hours · pop. 64,559
Cheyenne Board of Public Utilities
Gillette
no reports in the last 24 hours · pop. 33,501
City of Gillette Utilities
Laramie
no reports in the last 24 hours · pop. 32,599
City of Laramie Water