CA / Vacaville
CA · Tap water records
Vacaville tap water, in plain English
Here is what the EPA's own data shows about tap water in Vacaville. According to EPA SDWIS data retrieved June 2026, Vacaville is served by 12 active community water systems, together reported to serve about 37,568 people.
As of June 2026, EPA records show 80 violations across the community water system(s) serving Vacaville, going back to the earliest EPA record. 73 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.
What the EPA has on record, by system
Suisun-Solano Water Authority
29,105 served · surface water · PWSID CA4810005 - Health-based LEAD AND COPPER RULE REVISIONS: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in October 2024. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 40 times between July 2023 and July 2024. The EPA record lists a level of 0.082 MG/L; the limit (MCL) is 0.08 MG/L. EPA records do not show all of these as returned to compliance.
- Monitoring LEAD AND COPPER RULE REVISIONS: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 2024. EPA records do not show all of these as returned to compliance.
California State Prison - Solano
5,100 served · surface water · PWSID CA4810800 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in July 2017. The EPA record lists a level of 0.105 MG/L; the limit (MCL) is 0.08 MG/L. All have since returned to compliance, per EPA records.
Rural North Vacaville Water District
1,313 served · groundwater · PWSID CA4810013 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Vineyard Rv Park
550 served · groundwater · PWSID CA4800753 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Sid - Gibson Canyon
535 served · surface water · PWSID CA4810010 - Health-based LEAD AND COPPER RULE REVISIONS: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in October 2024. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Monitoring LEAD AND COPPER RULE REVISIONS: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 2024. EPA records do not show all of these as returned to compliance.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 2023. EPA records do not show all of these as returned to compliance.
Sid - Elmira
290 served · groundwater · PWSID CA4810011 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Imperial Manor Mobilehome Community
280 served · groundwater · PWSID CA3400190 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Sid - Quail Canyon
132 served · groundwater · PWSID CA4810012 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Sid - Pleasant Hills Ranch
89 served · surface water · PWSID CA4810025 - Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 23 times between April 2022 and October 2023. The EPA record lists a level of 0.061 MG/L; the limit (MCL) is 0.06 MG/L. EPA records do not show all of these as returned to compliance.
- Health-based Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in December 2002. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
Sid - Blue Ridge Oaks
63 served · surface water · PWSID CA4810024 - Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 2023. EPA records do not show all of these as returned to compliance.
Sid - Peabody
56 served · surface water · PWSID CA4810026 As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.
Riverside Mobile Home Park
55 served · groundwater · PWSID CA3900762 - Health-based Revised Total Coliform Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 5 times between February 2024 and March 2024. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based Coliform (TCR): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in March 2016. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times between July 2005 and July 2009. All have since returned to compliance, per EPA records.
What this means
A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.
This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.
Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.