CA / Rancho Cordova
CA · Tap water records
Rancho Cordova tap water, in plain English
Here is what the EPA's own data shows about tap water in Rancho Cordova. According to EPA SDWIS data retrieved June 2026, Rancho Cordova is served by 12 active community water systems, together reported to serve about 134,193 people.
As of June 2026, EPA records show 129 violations across the community water system(s) serving Rancho Cordova, going back to the earliest EPA record. 112 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
Golden State Water Co. - Cordova
47,161 served · surface water · PWSID CA3410015 - Health-based Coliform (TCR): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 4 times in August 1997. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
Golden State Water Company - Simi Valley
45,128 served · surface water · PWSID CA5610059 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.
Golden State Water Company - Bay Point
23,731 served · surface water · PWSID CA0710002 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.
Golden State Water Co - Arden Water Serv
5,658 served · groundwater · PWSID CA3410003 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.
Golden State Water Co.-Clearlake System
4,644 served · surface water · PWSID CA1710002 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.
Golden State Water Company - Nipomo
4,506 served · surface water · PWSID CA4010018 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.
Golden State Water Company-Cypress Ridge
2,026 served · groundwater · PWSID CA4010040 - Monitoring Public Notice: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2011. All have since returned to compliance, per EPA records.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between June 2007 and June 2008. All have since returned to compliance, per EPA records.
Golden State Water Company - Lake Marie
545 served · groundwater · PWSID CA4210022 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.
Hometown Colonial Estates Llc
400 served · groundwater · PWSID CA3400217 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.
Golden State Water Co. - Robbins
205 served · groundwater · PWSID CA5100107 - Health-based Arsenic: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 72 times between January 2016 and October 2021. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 9 times between July 2019 and July 2021. All have since returned to compliance, per EPA records.
Golden State Water Co - San Juan Oaks
159 served · groundwater · PWSID CA3510008 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.
Golden State Water Company - South Shore
30 served · surface water · PWSID CA1700519 - Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 30 times between April 2016 and July 2023. The EPA record lists a level of 71 UG/L; the limit (MCL) is 60 UG/L. 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 5 times between April 2016 and April 2023. The EPA record lists a level of 108 UG/L; the limit (MCL) is 80 UG/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 September 1999. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- 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 2020. EPA records do not show all of these as returned to compliance.
- Monitoring Total Haloacetic Acids (HAA5): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between January 2009 and January 2011. All have since returned to compliance, per EPA records.
- Monitoring TTHM: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between January 2009 and January 2011. 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.