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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

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Active public water systems in Alamosa County, Colorado
#Water systemCountyPopulation servedTypeSource
1Alamosa City ofAlamosa11,271CommunityGroundwater
2East AlamosaAlamosa1,453CommunityPurchased groundwater
3Great Sand Dunes HqAlamosa1,400Non-transient non-communityGroundwater
4Ramble CgAlamosa601Transient non-communityGroundwater
5Sangre De Cristo Lane Seven SchoolAlamosa445Non-transient non-communityGroundwater
6Great Sand Dunes Pinon Flats CgAlamosa250Transient non-communityGroundwater
7Wagon Wheel MHPAlamosa160CommunityGroundwater
8Splashland LLCAlamosa150Transient non-communityGroundwater
9Colorado GatorsAlamosa110Transient non-communityGroundwater
10Alamosa Migrant & Seasonal Head StartAlamosa109Transient non-communityGroundwater
11Koa AlamosaAlamosa99Transient non-communityGroundwater
12Valley Mobile Home LLCAlamosa85CommunityGroundwater
13San Luis Valley Rv ResortAlamosa66Transient non-communityGroundwater
14Rustic Rook ResortAlamosa49Transient non-communityGroundwater
15Great Sand Dunes LodgeAlamosa40Transient non-communityGroundwater
16Base Camp Family CampgroundAlamosa35Transient non-communityGroundwater
17Great Sand Dunes OasisAlamosa33Transient non-communityGroundwater

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

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).