Public water system · CA2910001
ActiveCity of Grass Valley
At a glance
City of Grass Valley (PWSID CA2910001) is an active community water system in Nevada County, California. It reports serving 4,947 people through 2,731 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
4,947
Service connections
2,731
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Grass Valley compare with other water systems in Nevada County?
By EPA's size categories, City of Grass Valley is a medium system (3,301 to 10,000 people). Nevada County has 82 active public water systems, and City of Grass Valley is the 6th-largest of them by population served. Its population served is about 3.9 times the county average of 1,263 people per system, and accounts for 4.8% of the 103,540 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 Grass Valley is about 26% below 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 City of Grass Valley?
EPA lists City of Grass Valley 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 82 active systems in Nevada County (23%) are also owned by a local government.
Does City of Grass Valley have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2019. The violations listed here began between October 1988 and October 2019. By type: 1 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 as resolved and 1 as archived. 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. 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 |
|---|---|---|---|---|
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1988-10-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
All 2 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.
City of Grass Valley: frequently asked questions
Who runs City of Grass Valley?
City of Grass Valley (PWSID CA2910001) 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 Grass Valley serve?
City of Grass Valley reports serving 4,947 people through 2,731 service connections in Nevada County, California.
Where does City of Grass Valley 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 City of Grass Valley have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2019. 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 Grass Valley'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 2 violations for this system; none is health-based, and the most recent began in October 2019. 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 Grass Valley's water quality report?
As a community water system, City of Grass Valley 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 Nevada County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Truckee-Donner PUD, Main | Nevada | 36,730 | Community | Groundwater |
| Nevada Id - E. George, Banner Mountain | Nevada | 17,154 | Community | Surface water |
| Nevada Id - Loma Rica | Nevada | 14,072 | Community | Surface water |
| Nevada Id - Lake Wildwood | Nevada | 9,108 | Community | Surface water |
| Nevada Id - Lake of Pines | Nevada | 6,870 | Community | Surface water |
| City of Nevada City | Nevada | 3,148 | 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, “City of Grass Valley, PWSID CA2910001, California”, https://aquacensus.com/water-systems/california/city-of-grass-valley-ca2910001 (data as of October 1, 2026).