Public water system · CA0900105
ActiveSomerset House Water System
At a glance
Somerset House Water System (PWSID CA0900105) is an active transient non-community water system in El Dorado County, California. It reports serving 100 people through 4 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
100
Service connections
4
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Somerset House Water System compare with other water systems in El Dorado County?
By EPA's size categories, Somerset House Water System is a very small system (500 people or fewer). El Dorado County has 124 active public water systems. Its population served is well below the county average of 2,351 people per system, and accounts for less than 0.1% 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 transient non-community water system reports serving 144 people, so Somerset House Water System is about 31% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. California has 3,016 active transient non-community water systems, 40% of the state's 7,479 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates Somerset House Water System?
EPA lists Somerset House Water System as privately owned. 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. 80 of the 124 active systems in El Dorado County (65%) are also privately owned.
Does Somerset House Water System have drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2014. The violations listed here began between July 2002 and January 2014. By type: 9 monitoring and reporting. The contaminant or rule involved most often is Nitrate (4 of them). EPA lists 9 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 |
|---|---|---|---|---|
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2012-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2007-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2005-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2002-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 9 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.
Somerset House Water System: frequently asked questions
Who runs Somerset House Water System?
Somerset House Water System (PWSID CA0900105) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Somerset House Water System serve?
Somerset House Water System reports serving 100 people through 4 service connections in El Dorado County, California.
Where does Somerset House Water System get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Somerset House Water System have any drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2014. 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 Somerset House Water System'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 9 violations for this system; none is health-based, and the most recent began in January 2014. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Somerset House Water System's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Somerset House Water System is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in El Dorado County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| El Dorado Id - Main | El Dorado | 132,171 | Community | Surface water |
| 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 |
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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, “Somerset House Water System, PWSID CA0900105, California”, https://aquacensus.com/water-systems/california/somerset-house-water-system-ca0900105 (data as of October 1, 2026).