Public water system · CA3310031
ActiveRiverside, City of
At a glance
City of Riverside (PWSID CA3310031) is an active community water system in Riverside County, California. It reports serving 298,398 people through 66,567 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is health-based, and the most recent began in June 1981.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
298,398
Service connections
66,567
Primary source
GU
Groundwater under influence of surface water
System type
CWS
Community water system
System record
How does City of Riverside compare with other water systems in Riverside County?
By EPA's size categories, City of Riverside is a very large system (more than 100,000 people). Riverside County has 197 active public water systems, and City of Riverside is the 2nd-largest of them by population served. Its population served is about 21 times the county average of 14,435 people per system, and accounts for 10% of the 2,843,721 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 City of Riverside is about 45 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. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 105 California systems (1.4%) list groundwater under influence of surface water as their primary source.
Who owns and regulates City of Riverside?
EPA lists City of Riverside 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. 50 of the 197 active systems in Riverside County (25%) are also owned by a local government.
Does City of Riverside have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in June 1981. By type: 1 contaminant level above the legal limit. The contaminant or rule involved is Nitrate. EPA lists 1 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1981-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
The one violation in EPA's records. 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.
City of Riverside: frequently asked questions
Who runs City of Riverside?
City of Riverside (PWSID CA3310031) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does City of Riverside serve?
City of Riverside reports serving 298,398 people through 66,567 service connections in Riverside County, California.
Where does City of Riverside get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does City of Riverside have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in June 1981. 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 City of Riverside'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 one violation for this system; it is health-based, and the most recent began in June 1981. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find City of Riverside's water quality report?
As a community water system, City of Riverside 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 Riverside County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Eastern Municipal Wd | Riverside | 666,581 | Community | Purchased surface water |
| Coachella Vwd: Cove Community | Riverside | 270,000 | Community | Groundwater |
| Elsinore Valley Mwd | Riverside | 169,455 | Community | Surface water |
| Corona, City of | Riverside | 168,575 | Community | Purchased surface water |
| Rancho California Water District | Riverside | 146,147 | Community | Purchased surface water |
| Jurupa Community Sd | Riverside | 135,093 | 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, “Riverside, City of, PWSID CA3310031, California”, https://aquacensus.com/water-systems/california/riverside-city-of-ca3310031 (data as of October 1, 2026).