Public water system · CA3410014
ActiveFolsom, City of - Main
At a glance
Folsom, City of - Main (PWSID CA3410014) is an active community water system in Sacramento County, California. It reports serving 80,969 people through 24,536 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in June 1993.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
80,969
Service connections
24,536
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Folsom, City of - Main compare with other water systems in Sacramento County?
By EPA's size categories, Folsom, City of - Main is a large system (10,001 to 100,000 people). Sacramento County has 164 active public water systems, and Folsom, City of - Main is the 4th-largest of them by population served. Its population served is about 7.8 times the county average of 10,325 people per system, and accounts for 4.8% of the 1,693,284 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Folsom, City of - Main is about 12 times that figure.
What does “community water system” mean?
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. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Folsom, City of - Main?
EPA lists Folsom, City of - Main as owned by a local government. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 37 of the 164 active systems in Sacramento County (23%) are also owned by a local government.
Does Folsom, City of - Main have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in June 1993. The violations listed here began between August 1992 and June 1993. By type: 2 monitoring and reporting, 1 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Surface Water Treatment Rule (2 of them). EPA lists 4 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1993-06-30 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-06-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 1992-12-30 | Public notice, recordkeeping or otherVariance/Exemption/Other Compliance · code 08 | Not reported | No | Resolved |
| 1992-08-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 4 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Folsom, City of - Main: frequently asked questions
Who runs Folsom, City of - Main?
Folsom, City of - Main (PWSID CA3410014) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Folsom, City of - Main serve?
Folsom, City of - Main reports serving 80,969 people through 24,536 service connections in Sacramento County, California.
Where does Folsom, City of - Main get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Folsom, City of - Main have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in June 1993. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Folsom, City of - Main's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in June 1993. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Folsom, City of - Main's water quality report?
As a community water system, Folsom, City of - Main must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Sacramento County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Sacramento Main | Sacramento | 527,979 | Community | Surface water |
| Sacramento Suburban Water District | Sacramento | 194,444 | Community | Purchased surface water |
| Scwa - Laguna/Vineyard | Sacramento | 184,896 | Community | Surface water |
| Citrus Heights Water District | Sacramento | 67,818 | Community | Purchased surface water |
| Cal Am - Suburban Rosemont | Sacramento | 54,793 | Community | Purchased surface water |
| Cal Am - Parkway | Sacramento | 50,573 | Community | Purchased surface water |
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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, “Folsom, City of - Main, PWSID CA3410014, California”, https://aquacensus.com/water-systems/california/folsom-city-of-main-ca3410014 (data as of October 1, 2026).