Public water system · CA0910001
ActiveEl Dorado Id - Main
At a glance
El Dorado Id - Main (PWSID CA0910001) is an active community water system in El Dorado County, California. It reports serving 132,171 people through 43,404 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; 3 are health-based, and the most recent began in December 2012.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
132,171
Service connections
43,404
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does El Dorado Id - Main compare with other water systems in El Dorado County?
By EPA's size categories, El Dorado Id - Main is a very large system (more than 100,000 people). El Dorado County has 124 active public water systems, and El Dorado Id - Main is the largest of them by population served. Its population served is about 56 times the county average of 2,351 people per system, and accounts for 45% of the 291,553 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 El Dorado Id - Main is about 20 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 El Dorado Id - Main?
EPA lists El Dorado Id - 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. 19 of the 124 active systems in El Dorado County (15%) are also owned by a local government.
Does El Dorado Id - Main have drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in December 2012. The violations listed here began between January 1998 and December 2012. By type: 3 required treatment not met and 1 monitoring and reporting. The contaminant or rule involved most often is Interim Enhanced 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 |
|---|---|---|---|---|
| 2012-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-07-22 | Required treatment not metTreatment Technique Uncovered Reservoir · code 47 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2001-06-08 | Required treatment not metTreatment Technique Uncovered Reservoir · code 47 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 1998-01-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | 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.
El Dorado Id - Main: frequently asked questions
Who runs El Dorado Id - Main?
El Dorado Id - Main (PWSID CA0910001) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does El Dorado Id - Main serve?
El Dorado Id - Main reports serving 132,171 people through 43,404 service connections in El Dorado County, California.
Where does El Dorado Id - 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 El Dorado Id - Main have any drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in December 2012. 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 El Dorado Id - 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; 3 are health-based, and the most recent began in December 2012. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find El Dorado Id - Main's water quality report?
As a community water system, El Dorado Id - 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 El Dorado County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| South Tahoe PUD - Main | El Dorado | 100,000 | Community | Groundwater |
| Georgetown Divide PUD | El Dorado | 9,434 | Community | Surface water |
| Placerville, City of - Main | El Dorado | 9,224 | Community | Purchased surface water |
| South Shore Recreation Area | El Dorado | 3,300 | Non-transient non-community | Groundwater |
| Lukins Brothers Water Company | El Dorado | 3,277 | Community | Groundwater |
| Lakeside Park Association | El Dorado | 2,648 | Community | 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, “El Dorado Id - Main, PWSID CA0910001, California”, https://aquacensus.com/water-systems/california/el-dorado-id-main-ca0910001 (data as of October 1, 2026).