Public water system · CA2300743
ActiveDolphin Isle Marina
At a glance
Dolphin Isle Marina (PWSID CA2300743) is an active community water system in Mendocino County, California. It reports serving 560 people through 86 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in November 2001.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
560
Service connections
86
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Dolphin Isle Marina compare with other water systems in Mendocino County?
By EPA's size categories, Dolphin Isle Marina is a small system (501 to 3,300 people). Mendocino County has 144 active public water systems. Its population served is roughly in line with the county average of 576 people per system, and accounts for 0.7% of the 82,868 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 Dolphin Isle Marina 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates Dolphin Isle Marina?
EPA lists Dolphin Isle Marina 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. 98 of the 144 active systems in Mendocino County (68%) are also privately owned.
Does Dolphin Isle Marina have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in November 2001. The violations listed here began between October 1997 and November 2001. By type: 5 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2001-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1999-09-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1999-05-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 6 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.
Dolphin Isle Marina: frequently asked questions
Who runs Dolphin Isle Marina?
Dolphin Isle Marina (PWSID CA2300743) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Dolphin Isle Marina serve?
Dolphin Isle Marina reports serving 560 people through 86 service connections in Mendocino County, California.
Where does Dolphin Isle Marina get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Dolphin Isle Marina have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in November 2001. 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 Dolphin Isle Marina'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 6 violations for this system; 1 is health-based, and the most recent began in November 2001. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Dolphin Isle Marina's water quality report?
As a community water system, Dolphin Isle Marina 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 Mendocino County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ukiah, City of | Mendocino | 16,607 | Community | Surface water |
| Fort Bragg, City of | Mendocino | 6,919 | Community | Surface water |
| Willits, City of | Mendocino | 6,175 | Community | Surface water |
| Millview County Water District | Mendocino | 5,500 | Community | Surface water |
| Redwood Valley County Water District | Mendocino | 5,200 | Community | Surface water |
| Willow County Water District | Mendocino | 3,797 | 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, “Dolphin Isle Marina, PWSID CA2300743, California”, https://aquacensus.com/water-systems/california/dolphin-isle-marina-ca2300743 (data as of October 1, 2026).