Skip to content
AquaCensus

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
Active public water systems in San Benito County, California
#Water systemCountyPopulation servedTypeSource
1Hollister, City ofSan Benito26,017CommunityPurchased surface water
2Sunnyslope County Water DistSan Benito24,954CommunityPurchased surface water
333rd District Agricultural AssociationSan Benito9,000Transient non-communityGroundwater
4San Benito High SchoolSan Benito3,310Non-transient non-communityGroundwater
5Aromas Water DistrictSan Benito2,988CommunityGroundwater
6San Juan Bautista, City ofSan Benito2,335CommunityGroundwater
7Pinnacles National Park-East DistrictSan Benito1,811Transient non-communityGroundwater
8Csp Hollister Hills SvraSan Benito1,220Transient non-communityGroundwater
9Taylor Farms Retail, Inc..San Benito1,055Non-transient non-communityGroundwater
10Thousand Trails San Benito PreserveSan Benito1,017CommunityGroundwater
11Rancho San Joaquin MwcSan Benito914CommunityGroundwater
12Pinnacles National Park CampgroundSan Benito647Transient non-communityGroundwater
13Pacific Scientific Energetic Mats. Comp.San Benito550Non-transient non-communityGroundwater
14Mission Oaks Mobile Home ParkSan Benito550CommunityGroundwater
15Kingdom Hall (Fallon Rd)San Benito500Transient non-communityGroundwater
16True Leaf Farms, LLC.San Benito372Non-transient non-communityGroundwater
17Tres Pinos CwdSan Benito350CommunityGroundwater
18George Chiala Farms, Inc...San Benito350Non-transient non-communityGroundwater
19Pinnacles National Park-West DistrictSan Benito328Transient non-communityGroundwater
20Dunneville Market & KitchenSan Benito300Transient non-communityGroundwater
21Southside Elementary SchoolSan Benito300Non-transient non-communityGroundwater
22Anzar High SchoolSan Benito268Non-transient non-communityGroundwater
23Csp-Fremont PeakSan Benito250Transient non-communityGroundwater
24Csa No. 31 Stonegate WsSan Benito230CommunitySurface water
25T & A OnionsSan Benito165Non-transient non-communityGroundwater
26San Justo Mutual Water CompanySan Benito160CommunityGroundwater
27Golden State Water Co - San Juan OaksSan Benito159CommunityGroundwater
28Hollister Ranch EstatesSan Benito150CommunityGroundwater
29Rosa Morada Mutual Water CompanySan Benito138CommunityGroundwater
30Ashford Highlands MwcSan Benito132CommunityGroundwater
31Hollister Sda Christian SchoolSan Benito122Non-transient non-communityGroundwater
32Dunneville Estates Csa #50San Benito120CommunityGroundwater
33Mcalpine Lake & ParkSan Benito111Non-transient non-communityGroundwater
34Mission Farm R.V. ParkSan Benito110CommunityGroundwater
35Mcmahon Road Mutual Water CompanySan Benito102CommunityGroundwater
36Fireclay TileSan Benito100Non-transient non-communityGroundwater
37Comstock Mutual Water CompanySan Benito100CommunityGroundwater
38Union Heights MwcSan Benito98CommunityGroundwater
39Villa Robles Water SystemSan Benito96Transient non-communityGroundwater
40Vineyard Estates MwcSan Benito90CommunityGroundwater
41Fallon Road Labor HousingSan Benito84CommunityGroundwater
42Willis Construction WsSan Benito76Non-transient non-communityGroundwater
43St. Francis Retreat CenterSan Benito69Transient non-communityGroundwater under influence of surface water
44Creekbridge Mutual Water CompanySan Benito69CommunityGroundwater
45Enza Zaden ResearchSan Benito65Non-transient non-communityGroundwater
46Valenzuela Water SystemSan Benito55CommunityGroundwater
47Casa De Fruta OrchardsSan Benito53CommunityGroundwater
48Paicines RanchSan Benito52Non-transient non-communityGroundwater
49Cienega WinerySan Benito50Transient non-communityGroundwater
50Venture Estates MwcSan Benito50CommunityGroundwater

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.

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

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).