Public water system · CA3110028
ActiveNorthstar C.S.D.
At a glance
Northstar C.S.D. (PWSID CA3110028) is an active community water system in Placer County, California. It reports serving 15,452 people through 955 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; all are health-based, and the most recent began in May 2006.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
15,452
Service connections
955
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Northstar C.S.D. compare with other water systems in Placer County?
By EPA's size categories, Northstar C.S.D. is a large system (10,001 to 100,000 people). Placer County has 116 active public water systems, and Northstar C.S.D. is the 5th-largest of them by population served. Its population served is about 4.2 times the county average of 3,692 people per system, and accounts for 3.6% of the 428,242 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 Northstar C.S.D. is about 131% above 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 Northstar C.S.D.?
EPA lists Northstar C.S.D. 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. 35 of the 116 active systems in Placer County (30%) are also owned by a local government.
Does Northstar C.S.D. have drinking water violations?
EPA's records list 3 violations for this system; all are health-based, and the most recent began in May 2006. The violations listed here began between June 1993 and May 2006. By type: 3 required treatment not met. The contaminant or rule involved most often is Surface Water Treatment Rule (3 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2006-05-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1993-08-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1993-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 3 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.
Northstar C.S.D.: frequently asked questions
Who runs Northstar C.S.D.?
Northstar C.S.D. (PWSID CA3110028) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Northstar C.S.D. serve?
Northstar C.S.D. reports serving 15,452 people through 955 service connections in Placer County, California.
Where does Northstar C.S.D. 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 Northstar C.S.D. have any drinking water violations?
EPA's records list 3 violations for this system; all are health-based, and the most recent began in May 2006. 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 Northstar C.S.D.'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 3 violations for this system; all are health-based, and the most recent began in May 2006. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Northstar C.S.D.'s water quality report?
As a community water system, Northstar C.S.D. 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 Placer County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Roseville | Placer | 155,612 | Community | Surface water |
| Placer Cwa - Foothill | Placer | 89,544 | Community | Surface water |
| City of Lincoln | Placer | 54,538 | Community | Purchased surface water |
| Placer Cwa - Auburn/Bowman | Placer | 27,294 | Community | Surface water |
| Cal Am - West Placer | Placer | 8,861 | Community | Purchased surface water |
| Nevada Id - North Auburn | Placer | 6,870 | Community | Surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Northstar C.S.D., PWSID CA3110028, California”, https://aquacensus.com/water-systems/california/northstar-c-s-d-ca3110028 (data as of October 1, 2026).