Tapcensus

California

Solano County drinking water quality

64 active public water systems serve 472,818 people in Solano County. 52 are compliant, 12 had at least one EPA violation in the past three years, 0 are designated serious violators, and 7 carry a health flag.

Active systems 64 26 community systems
People served 473K by public water systems
Systems with violations 12 19% of active systems, past 3 years
Serious violators 0 7 systems carry a health flag

Needs attention

City of Fairfield CA4810003 · Fairfield · Community water system · Serves 120,720 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Suisun-Solano Water Authority CA4810005 · Community water system · Serves 29,105 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Sid Gibson Canyon CA4810010 · Community water system · Serves 535 2 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Rockwell Collins Inc. (fka Upco-Utas) CA4800596 · Non-Transient non-community system · Serves 510 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Dixon Migrant Center CA4800804 · Non-Transient non-community system · Serves 346 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Hidden Acres Trailer Villa CA4800564 · Community water system · Serves 80 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Collinsville Water Works CA4800511 · Community water system · Serves 25 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).

Community water systems

26 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
City of Vallejo
Vallejo 		121,420 0 0
City of Fairfield
Fairfield 		120,720 1 1
City of Vacaville
Vacaville 		99,650 0 0
Suisun-Solano Water Authority
 29,105 2 1
City of Benicia
Benicia 		27,131 0 0
California Water Service Co.-Travis Afb
 18,111 0 0
City of Dixon
 12,540 0 0
City of Rio Vista
Rio Vista 		11,206 1 1
California Water Service Co. Dixon
 10,623 0 0
California State Prison Solano
 3,882 0 0
City of Vallejo-Lakes System
Vallejo 		2,800 0 0
Rural North Vacaville Water District
 1,313 0 0
Vineyard RV Park
 550 0 0
Sid Gibson Canyon
 535 2 2
Sid Elmira
 290 0 0
Sid Quail Canyon
 132 0 0
Sid Pleasant Hills Ranch
 89 1 0
Hidden Acres Trailer Villa
 80 1 1
Delta Conservation Camp
 65 0 0
Sid Blue Ridge Oaks
 63 1 1
Vaca Villa Apartments
 60 0 0
Sid Peabody
 56 0 0
Collinsville Water Works
 25 1 1
Cresta Mesa Parque
 25 0 0
Snug Harbor RV LP
 24 0 0
Travis Afb Wtp Vallejo
 3 0 0
Non-community systems (38: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Hunter Hill Safety Roadside Rest Area
 3,707 0 0
Self-Serve Petroleum
 1,210 0 0
Valley Evangelical Free Church
 1,200 0 0
Lake Solano Park
 1,019 0 0
Rush Ranch Open Space
 656 0 0
Rockwell Collins Inc. (fka Upco-Utas)
 510 1 1
Dixon Migrant Center
 346 1 1
Mariani Packing Company, Inc.
 320 0 0
Gill Sidhu Chevron
 255 0 0
Wooden Valley Winery
 250 0 0
Connection Point Church
Vacaville 		202 0 0
Northbay Logistics Center Fka Savemart
 180 0 0
Neil's Service Center
 170 0 0
Moose Lodge 1967
 159 0 0
Superior Packing CO
 156 0 0
Punjabi Dhaba
 155 0 0
Hines Nurseries Winters North
 150 2 1
Dixon 76
 149 0 0
Pedrick Produce
 120 1 0
Midway Stars 76 Gas Station & Food Mart
Vacaville 		111 0 0
Sievers Water Works
Vacaville 		110 0 0
West Wind Winery
 103 0 0
Birds Landing Hunting Preserve
 100 0 0
Blue Victorian Winery
 100 0 0
Hastings Island Hunting Preserve
 100 0 0
Hines Nursery Winters South
 100 0 0
Midway Foods
 100 0 0
Caymus Cordelia Winery
Fairfield 		75 0 0
Easterly Wwtp Vacaville
Vacaville 		70 0 0
Harris Moran Seed Company
 64 0 0
Gotham Greens
Davis 		60 0 0
Neil's Service Center II
 55 0 0
Stocking Ranch Deepwell
 53 0 0
Western Railway Museum
 50 0 0
Midway RV Park
 48 0 0
EB Stone
 42 0 0
Vaca-Dixon Substation
 40 0 0
Campbell Soup Dixon
 25 0 0
Inactive systems (123, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.