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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

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Active public water systems in San Juan County, New Mexico
#Water systemCountyPopulation servedTypeSource
1Farmington Water SystemSan Juan47,655CommunitySurface water
2Aztec Domestic Water SystemSan Juan9,673CommunitySurface water
3Bloomfield Water Supply SystemSan Juan9,536CommunitySurface water
4Lee Hammond WaterSan Juan8,817CommunitySurface water
5Lower Valley Water Users AssociationSan Juan7,615CommunitySurface water
6Morningstar Water SystemSan Juan5,694CommunityPurchased surface water
7Northstar MdwcaSan Juan3,784CommunitySurface water
8Flora Vista Mutual DomesticSan Juan3,726CommunityPurchased surface water
9Upper La Plata Water Users AssociationSan Juan2,265CommunityPurchased surface water
10Southside Mutual Domestic WaterSan Juan1,609CommunityPurchased surface water
11Blanco MdwcaSan Juan1,148CommunityPurchased surface water
12Navajo Dam Domestic Water Consumers Inc.San Juan545CommunitySurface water
13Apple Orchard MdwcaSan Juan460CommunityPurchased surface water
14Chaco Culture National Historic ParkSan Juan250Non-transient non-communityGroundwater
15Navajo Lake State Park - Pine SiteSan Juan250Transient non-communitySurface water
16Rosa Joint Ventures Water SystemSan Juan239CommunityGroundwater
17La Vida Mission Community Water SupplySan Juan200CommunityGroundwater
18Navajo Lake State Park - Cottonwood CampSan Juan158Transient non-communityGroundwater under influence of surface water
19Pine River MdcaSan Juan44CommunityGroundwater under influence of surface water
20Enterprise Products Company Chaco PlantSan Juan28Non-transient non-communitySurface water
21Hydro Pure Technology Inc..San Juan25Transient non-communityPurchased 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

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).