Alamosa County, Colorado — public water systems
At a glance
17 active public water systems are filed under Alamosa County, Colorado in EPA's SDWIS records, together reporting 16,356 people served. The largest is City of Alamosa, which reports serving 11,271 people. 4 are community water systems serving people where they live; the other 13 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
17
Population served
16.4K
Community systems
4
Groundwater share
100%
How does Alamosa County compare with other Colorado counties?
Alamosa County has the 34th-most active public water systems among the 113 counties listed for active Colorado systems in EPA records; among the 65 with 3 or more systems, the median has 18. Its systems report 16,356 people served in total, the 33rd-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 962 people, well below the Colorado average of 3,400. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Alamosa County's drinking water come from?
By primary water source, Alamosa County's active systems draw on groundwater (16, 94%) and purchased groundwater (1, 5.9%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 74% and 26% across Colorado. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Alamosa, draws primarily on groundwater.
What kinds of water systems operate in Alamosa County?
Alamosa County's active systems break down as 4 community systems (24%), 2 non-transient non-community systems (12%) and 11 transient non-community systems (65%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (65%), local government (24%) and federal government (12%).
Water systems in Alamosa County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Alamosa City of | Alamosa | 11,271 | Community | Groundwater |
| 2 | East Alamosa | Alamosa | 1,453 | Community | Purchased groundwater |
| 3 | Great Sand Dunes Hq | Alamosa | 1,400 | Non-transient non-community | Groundwater |
| 4 | Ramble Cg | Alamosa | 601 | Transient non-community | Groundwater |
| 5 | Sangre De Cristo Lane Seven School | Alamosa | 445 | Non-transient non-community | Groundwater |
| 6 | Great Sand Dunes Pinon Flats Cg | Alamosa | 250 | Transient non-community | Groundwater |
| 7 | Wagon Wheel MHP | Alamosa | 160 | Community | Groundwater |
| 8 | Splashland LLC | Alamosa | 150 | Transient non-community | Groundwater |
| 9 | Colorado Gators | Alamosa | 110 | Transient non-community | Groundwater |
| 10 | Alamosa Migrant & Seasonal Head Start | Alamosa | 109 | Transient non-community | Groundwater |
| 11 | Koa Alamosa | Alamosa | 99 | Transient non-community | Groundwater |
| 12 | Valley Mobile Home LLC | Alamosa | 85 | Community | Groundwater |
| 13 | San Luis Valley Rv Resort | Alamosa | 66 | Transient non-community | Groundwater |
| 14 | Rustic Rook Resort | Alamosa | 49 | Transient non-community | Groundwater |
| 15 | Great Sand Dunes Lodge | Alamosa | 40 | Transient non-community | Groundwater |
| 16 | Base Camp Family Campground | Alamosa | 35 | Transient non-community | Groundwater |
| 17 | Great Sand Dunes Oasis | Alamosa | 33 | Transient non-community | Groundwater |
Alamosa County water systems: frequently asked questions
How many public water systems are in Alamosa County, Colorado?
EPA's SDWIS records file 17 active public water systems under Alamosa County, Colorado: 4 community systems (24%), 2 non-transient non-community systems (12%) and 11 transient non-community systems (65%).
Who supplies drinking water in Alamosa County, CO?
The largest community water systems filed under Alamosa County are City of Alamosa (11,271 people served), East Alamosa (1,453 people served) and Wagon Wheel MHP (160 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Alamosa County's drinking water come from groundwater or surface water?
Of the 17 active public water systems in Alamosa County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, City of Alamosa, uses groundwater.
Where can I find a water quality report for Alamosa County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 4 community systems are filed under Alamosa County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Alamosa County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Colorado water systems
- All Colorado public water systems· 2,207 active
- Gilpin County· 20 systems
- San Miguel County· 20 systems
- Lake County· 19 systems
- Las Animas County· 18 systems
- Custer County· 17 systems
- Montezuma County· 17 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Alamosa County, Colorado”, https://aquacensus.com/water-systems/colorado/alamosa (data as of October 1, 2026).