Public water system · CA4900514
ActiveRancho Del Paradiso-Cal Water Svc (Puc)
At a glance
Rancho Del Paradiso-Cal Water Svc (Puc) (PWSID CA4900514) is an active community water system in Sonoma County, California. It reports serving 94 people through 60 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 September 1984.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
94
Service connections
60
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Rancho Del Paradiso-Cal Water Svc (Puc) compare with other water systems in Sonoma County?
By EPA's size categories, Rancho Del Paradiso-Cal Water Svc (Puc) is a very small system (500 people or fewer). Sonoma County has 441 active public water systems. Its population served is well below the county average of 1,092 people per system, and accounts for less than 0.1% 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 Rancho Del Paradiso-Cal Water Svc (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 Rancho Del Paradiso-Cal Water Svc (Puc)?
EPA lists Rancho Del Paradiso-Cal Water Svc (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 Rancho Del Paradiso-Cal Water Svc (Puc) have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in September 1984. The violations listed here began between October 1980 and September 1984. By type: 2 public notice, recordkeeping or other and 2 monitoring and reporting. The contaminant or rule involved most often is Gross alpha (excluding radon and uranium) (2 of them). EPA lists 4 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 |
|---|---|---|---|---|
| 1984-09-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-07-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1981-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1980-10-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | 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.
Rancho Del Paradiso-Cal Water Svc (Puc): frequently asked questions
Who runs Rancho Del Paradiso-Cal Water Svc (Puc)?
Rancho Del Paradiso-Cal Water Svc (Puc) (PWSID CA4900514) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Rancho Del Paradiso-Cal Water Svc (Puc) serve?
Rancho Del Paradiso-Cal Water Svc (Puc) reports serving 94 people through 60 service connections in Sonoma County, California.
Where does Rancho Del Paradiso-Cal Water Svc (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 Rancho Del Paradiso-Cal Water Svc (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 September 1984. 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 Rancho Del Paradiso-Cal Water Svc (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 September 1984. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Rancho Del Paradiso-Cal Water Svc (Puc)'s water quality report?
As a community water system, Rancho Del Paradiso-Cal Water Svc (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, “Rancho Del Paradiso-Cal Water Svc (Puc), PWSID CA4900514, California”, https://aquacensus.com/water-systems/california/rancho-del-paradiso-cal-water-svc-puc-ca4900514 (data as of October 1, 2026).