Public water system · CA4910003
ActivePenngrove Water Company (Puc)
At a glance
Penngrove Water Company (Puc) (PWSID CA4910003) is an active community water system in Sonoma County, California. It reports serving 1,742 people through 530 service connections. Its primary water source is purchased groundwater, and EPA lists it as privately owned. EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,742
Service connections
530
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Penngrove Water Company (Puc) compare with other water systems in Sonoma County?
By EPA's size categories, Penngrove Water Company (Puc) is a small system (501 to 3,300 people). Sonoma County has 441 active public water systems. Its population served is about 60% above the county average of 1,092 people per system, and accounts for 0.4% of the 481,435 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 Penngrove Water Company (Puc) is well 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 76 California systems (1%) list purchased groundwater as their primary source.
Who owns and regulates Penngrove Water Company (Puc)?
EPA lists Penngrove Water Company (Puc) 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. 371 of the 441 active systems in Sonoma County (84%) are also privately owned.
Does Penngrove Water Company (Puc) have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2017. The violations listed here began between March 1989 and October 2017. By type: 3 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 3 as archived and 1 as resolved. 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. 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 |
|---|---|---|---|---|
| 2017-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1989-08-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1989-04-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1989-03-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
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.
Penngrove Water Company (Puc): frequently asked questions
Who runs Penngrove Water Company (Puc)?
Penngrove Water Company (Puc) (PWSID CA4910003) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Penngrove Water Company (Puc) serve?
Penngrove Water Company (Puc) reports serving 1,742 people through 530 service connections in Sonoma County, California.
Where does Penngrove Water Company (Puc) get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Penngrove Water Company (Puc) have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2017. 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 Penngrove Water Company (Puc)'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; none is health-based, and the most recent began in October 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Penngrove Water Company (Puc)'s water quality report?
As a community water system, Penngrove Water Company (Puc) 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 Sonoma County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Santa Rosa, City of | Sonoma | 175,396 | Community | Groundwater |
| Petaluma, City of | Sonoma | 60,781 | Community | Groundwater |
| Rohnert Park, City of | Sonoma | 43,821 | Community | Groundwater |
| Windsor, Town of | Sonoma | 25,561 | Community | Groundwater |
| Valley of the Moon Water District | Sonoma | 23,107 | Community | Groundwater |
| Sonoma, City of | Sonoma | 11,725 | 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, “Penngrove Water Company (Puc), PWSID CA4910003, California”, https://aquacensus.com/water-systems/california/penngrove-water-company-puc-ca4910003 (data as of October 1, 2026).