San Benito County, California — public water systems
At a glance
63 active public water systems are filed under San Benito County, California in EPA's SDWIS records, together reporting 82,670 people served. The largest is City of Hollister, which reports serving 26,017 people. 31 are community water systems serving people where they live; the other 32 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
63
Population served
82.7K
Community systems
31
Groundwater share
93.7%
How does San Benito County compare with other California counties?
San Benito County has the 40th-most active public water systems among the 201 counties listed for active California systems in EPA records; among the 72 with 3 or more systems, the median has 73. Its systems report 82,670 people served in total, the 40th-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 1,312 people, well below the California average of 5,706. 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 Benito County's drinking water come from?
By primary water source, San Benito County's active systems draw on groundwater (58, 92%), surface water (2, 3.2%), purchased surface water (2, 3.2%) and groundwater under influence of surface water (1, 1.6%). Overall, 94% rely mainly on groundwater (including purchased groundwater) and 6.3% on surface water, compared with 85% and 15% across California. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Hollister, draws primarily on purchased surface water.
What kinds of water systems operate in San Benito County?
San Benito County's active systems break down as 31 community systems (49%), 17 non-transient non-community systems (27%) and 15 transient non-community systems (24%). 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 (73%), local government (17%), state government (4.8%) and federal government (4.8%).
The 50 largest water systems in San Benito County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Hollister, City of | San Benito | 26,017 | Community | Purchased surface water |
| 2 | Sunnyslope County Water Dist | San Benito | 24,954 | Community | Purchased surface water |
| 3 | 33rd District Agricultural Association | San Benito | 9,000 | Transient non-community | Groundwater |
| 4 | San Benito High School | San Benito | 3,310 | Non-transient non-community | Groundwater |
| 5 | Aromas Water District | San Benito | 2,988 | Community | Groundwater |
| 6 | San Juan Bautista, City of | San Benito | 2,335 | Community | Groundwater |
| 7 | Pinnacles National Park-East District | San Benito | 1,811 | Transient non-community | Groundwater |
| 8 | Csp Hollister Hills Svra | San Benito | 1,220 | Transient non-community | Groundwater |
| 9 | Taylor Farms Retail, Inc.. | San Benito | 1,055 | Non-transient non-community | Groundwater |
| 10 | Thousand Trails San Benito Preserve | San Benito | 1,017 | Community | Groundwater |
| 11 | Rancho San Joaquin Mwc | San Benito | 914 | Community | Groundwater |
| 12 | Pinnacles National Park Campground | San Benito | 647 | Transient non-community | Groundwater |
| 13 | Pacific Scientific Energetic Mats. Comp. | San Benito | 550 | Non-transient non-community | Groundwater |
| 14 | Mission Oaks Mobile Home Park | San Benito | 550 | Community | Groundwater |
| 15 | Kingdom Hall (Fallon Rd) | San Benito | 500 | Transient non-community | Groundwater |
| 16 | True Leaf Farms, LLC. | San Benito | 372 | Non-transient non-community | Groundwater |
| 17 | Tres Pinos Cwd | San Benito | 350 | Community | Groundwater |
| 18 | George Chiala Farms, Inc... | San Benito | 350 | Non-transient non-community | Groundwater |
| 19 | Pinnacles National Park-West District | San Benito | 328 | Transient non-community | Groundwater |
| 20 | Dunneville Market & Kitchen | San Benito | 300 | Transient non-community | Groundwater |
| 21 | Southside Elementary School | San Benito | 300 | Non-transient non-community | Groundwater |
| 22 | Anzar High School | San Benito | 268 | Non-transient non-community | Groundwater |
| 23 | Csp-Fremont Peak | San Benito | 250 | Transient non-community | Groundwater |
| 24 | Csa No. 31 Stonegate Ws | San Benito | 230 | Community | Surface water |
| 25 | T & A Onions | San Benito | 165 | Non-transient non-community | Groundwater |
| 26 | San Justo Mutual Water Company | San Benito | 160 | Community | Groundwater |
| 27 | Golden State Water Co - San Juan Oaks | San Benito | 159 | Community | Groundwater |
| 28 | Hollister Ranch Estates | San Benito | 150 | Community | Groundwater |
| 29 | Rosa Morada Mutual Water Company | San Benito | 138 | Community | Groundwater |
| 30 | Ashford Highlands Mwc | San Benito | 132 | Community | Groundwater |
| 31 | Hollister Sda Christian School | San Benito | 122 | Non-transient non-community | Groundwater |
| 32 | Dunneville Estates Csa #50 | San Benito | 120 | Community | Groundwater |
| 33 | Mcalpine Lake & Park | San Benito | 111 | Non-transient non-community | Groundwater |
| 34 | Mission Farm R.V. Park | San Benito | 110 | Community | Groundwater |
| 35 | Mcmahon Road Mutual Water Company | San Benito | 102 | Community | Groundwater |
| 36 | Fireclay Tile | San Benito | 100 | Non-transient non-community | Groundwater |
| 37 | Comstock Mutual Water Company | San Benito | 100 | Community | Groundwater |
| 38 | Union Heights Mwc | San Benito | 98 | Community | Groundwater |
| 39 | Villa Robles Water System | San Benito | 96 | Transient non-community | Groundwater |
| 40 | Vineyard Estates Mwc | San Benito | 90 | Community | Groundwater |
| 41 | Fallon Road Labor Housing | San Benito | 84 | Community | Groundwater |
| 42 | Willis Construction Ws | San Benito | 76 | Non-transient non-community | Groundwater |
| 43 | St. Francis Retreat Center | San Benito | 69 | Transient non-community | Groundwater under influence of surface water |
| 44 | Creekbridge Mutual Water Company | San Benito | 69 | Community | Groundwater |
| 45 | Enza Zaden Research | San Benito | 65 | Non-transient non-community | Groundwater |
| 46 | Valenzuela Water System | San Benito | 55 | Community | Groundwater |
| 47 | Casa De Fruta Orchards | San Benito | 53 | Community | Groundwater |
| 48 | Paicines Ranch | San Benito | 52 | Non-transient non-community | Groundwater |
| 49 | Cienega Winery | San Benito | 50 | Transient non-community | Groundwater |
| 50 | Venture Estates Mwc | San Benito | 50 | Community | Groundwater |
All other water systems in San Benito County (13)
The remaining active systems filed under San Benito County, largest first, with the population each reports serving.
- Springwood Estates Mwc50
- Quintero Labor Camp #1 (Wright Rd)50
- Paicines Water System50
- Betabel Rv Resort49
- Whispering Pines Inn38
- Los Madrones Mwc36
- Tri-Cal Incorporated35
- B & R Farms34
- Aromas Hills Mutual Water Association33
- Bayer Research and Development LLC28
- Willow Grove Union Elementary School25
- San Benito County Water District25
- San Benito County Historical Park25
San Benito County water systems: frequently asked questions
How many public water systems are in San Benito County, California?
EPA's SDWIS records file 63 active public water systems under San Benito County, California: 31 community systems (49%), 17 non-transient non-community systems (27%) and 15 transient non-community systems (24%).
Who supplies drinking water in San Benito County, CA?
The largest community water systems filed under San Benito County are City of Hollister (26,017 people served), Sunnyslope County Water Dist (24,954 people served) and Aromas Water District (2,988 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 Benito County's drinking water come from groundwater or surface water?
Of the 63 active public water systems in San Benito County, 94% draw mainly on groundwater and 6.3% on surface water, counting purchased supplies. The largest system, City of Hollister, uses purchased surface water.
Where can I find a water quality report for San Benito 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. 31 community systems are filed under San Benito 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 Benito 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 California water systems
- All California public water systems· 7,479 active
- Imperial County· 76 systems
- Siskiyou County· 69 systems
- Amador County· 67 systems
- Mariposa County· 67 systems
- Solano County· 63 systems
- Yuba County· 62 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 Benito County, California”, https://aquacensus.com/water-systems/california/san-benito (data as of October 1, 2026).