San Juan County, New Mexico — public water systems
At a glance
22 active public water systems are filed under San Juan County, New Mexico in EPA's SDWIS records, together reporting 103,721 people served. The largest is Farmington Water System, which reports serving 47,655 people. 17 are community water systems serving people where they live; the other 5 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
22
Population served
103.7K
Community systems
17
Groundwater share
22.7%
How does San Juan County compare with other New Mexico counties?
San Juan County has the 17th-most active public water systems among the 49 counties listed for active New Mexico systems in EPA records; among the 31 with 3 or more systems, the median has 23. Its systems report 103,721 people served in total, the 5th-largest county figure in the state and 4.7% of the statewide total. The average system here reports serving 4,715 people, about 150% above the New Mexico average of 1,885. 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 San Juan County's drinking water come from?
By primary water source, San Juan County's active systems draw on surface water (10, 45%), purchased surface water (7, 32%), groundwater (3, 14%) and groundwater under influence of surface water (2, 9.1%). Overall, 23% rely mainly on groundwater (including purchased groundwater) and 77% on surface water, compared with 93% and 7.2% across New Mexico. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. The county's largest system, Farmington Water System, draws primarily on surface water.
What kinds of water systems operate in San Juan County?
San Juan County's active systems break down as 17 community systems (77%), 2 non-transient non-community systems (9.1%) and 3 transient non-community systems (14%). 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 local government (55%), private (27%), federal government (9.1%) and state government (9.1%).
Water systems in San Juan County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Farmington Water System | San Juan | 47,655 | Community | Surface water |
| 2 | Aztec Domestic Water System | San Juan | 9,673 | Community | Surface water |
| 3 | Bloomfield Water Supply System | San Juan | 9,536 | Community | Surface water |
| 4 | Lee Hammond Water | San Juan | 8,817 | Community | Surface water |
| 5 | Lower Valley Water Users Association | San Juan | 7,615 | Community | Surface water |
| 6 | Morningstar Water System | San Juan | 5,694 | Community | Purchased surface water |
| 7 | Northstar Mdwca | San Juan | 3,784 | Community | Surface water |
| 8 | Flora Vista Mutual Domestic | San Juan | 3,726 | Community | Purchased surface water |
| 9 | Upper La Plata Water Users Association | San Juan | 2,265 | Community | Purchased surface water |
| 10 | Southside Mutual Domestic Water | San Juan | 1,609 | Community | Purchased surface water |
| 11 | Blanco Mdwca | San Juan | 1,148 | Community | Purchased surface water |
| 12 | Navajo Dam Domestic Water Consumers Inc. | San Juan | 545 | Community | Surface water |
| 13 | Apple Orchard Mdwca | San Juan | 460 | Community | Purchased surface water |
| 14 | Chaco Culture National Historic Park | San Juan | 250 | Non-transient non-community | Groundwater |
| 15 | Navajo Lake State Park - Pine Site | San Juan | 250 | Transient non-community | Surface water |
| 16 | Rosa Joint Ventures Water System | San Juan | 239 | Community | Groundwater |
| 17 | La Vida Mission Community Water Supply | San Juan | 200 | Community | Groundwater |
| 18 | Navajo Lake State Park - Cottonwood Camp | San Juan | 158 | Transient non-community | Groundwater under influence of surface water |
| 19 | Pine River Mdca | San Juan | 44 | Community | Groundwater under influence of surface water |
| 20 | Enterprise Products Company Chaco Plant | San Juan | 28 | Non-transient non-community | Surface water |
| 21 | Hydro Pure Technology Inc.. | San Juan | 25 | Transient non-community | Purchased surface water |
San Juan County water systems: frequently asked questions
How many public water systems are in San Juan County, New Mexico?
EPA's SDWIS records file 22 active public water systems under San Juan County, New Mexico: 17 community systems (77%), 2 non-transient non-community systems (9.1%) and 3 transient non-community systems (14%).
Who supplies drinking water in San Juan County, NM?
The largest community water systems filed under San Juan County are Farmington Water System (47,655 people served), Aztec Domestic Water System (9,673 people served) and Bloomfield Water Supply System (9,536 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 San Juan County's drinking water come from groundwater or surface water?
Of the 22 active public water systems in San Juan County, 23% draw mainly on groundwater and 77% on surface water, counting purchased supplies. The largest system, Farmington Water System, uses surface water.
Where can I find a water quality report for San Juan 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. 17 community systems are filed under San Juan 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 San Juan 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 New Mexico water systems
- All New Mexico public water systems· 1,165 active
- Valencia County· 28 systems
- McKinley County· 27 systems
- Torrance County· 27 systems
- Lea County· 23 systems
- Sierra County· 21 systems
- Mora County· 20 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 San Juan County, New Mexico”, https://aquacensus.com/water-systems/new-mexico/san-juan (data as of October 1, 2026).