Public water system · CA4400621
ActiveRiver Grove Mutual Water Assn
At a glance
River Grove Mutual Water Assn (PWSID CA4400621) is an active community water system in Santa Cruz County, California. It reports serving 54 people through 25 service connections. Its primary water source is surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in August 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
54
Service connections
25
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does River Grove Mutual Water Assn compare with other water systems in Santa Cruz County?
By EPA's size categories, River Grove Mutual Water Assn is a very small system (500 people or fewer). Santa Cruz County has 96 active public water systems. Its population served is well below the county average of 2,856 people per system, and accounts for less than 0.1% of the 274,204 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 River Grove Mutual Water Assn 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. 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 River Grove Mutual Water Assn?
EPA lists River Grove Mutual Water Assn 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. 76 of the 96 active systems in Santa Cruz County (79%) are also privately owned.
Does River Grove Mutual Water Assn have drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in August 2024. The violations listed here began between October 2016 and August 2024. By type: 7 required treatment not met, 4 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Surface Water Treatment Rule (3 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2024-08-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2024-02-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2023-03-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-01-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2023-01-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2022-01-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2021-12-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2016-10-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
The 12 most recent 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.
River Grove Mutual Water Assn: frequently asked questions
Who runs River Grove Mutual Water Assn?
River Grove Mutual Water Assn (PWSID CA4400621) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does River Grove Mutual Water Assn serve?
River Grove Mutual Water Assn reports serving 54 people through 25 service connections in Santa Cruz County, California.
Where does River Grove Mutual Water Assn 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 River Grove Mutual Water Assn have any drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in August 2024. 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 River Grove Mutual Water Assn'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. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in August 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find River Grove Mutual Water Assn's water quality report?
As a community water system, River Grove Mutual Water Assn 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 Santa Cruz County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Santa Cruz Water Department | Santa Cruz | 94,626 | Community | Surface water |
| Watsonville, City of | Santa Cruz | 65,231 | Community | Surface water |
| Soquel Creek Water District | Santa Cruz | 40,809 | Community | Purchased surface water |
| San Lorenzo Valley Water Dist | Santa Cruz | 21,145 | Community | Surface water |
| Cabrillo College | Santa Cruz | 12,000 | Non-transient non-community | Groundwater |
| Scotts Valley Water District | Santa Cruz | 11,197 | Community | Groundwater |
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, “River Grove Mutual Water Assn, PWSID CA4400621, California”, https://aquacensus.com/water-systems/california/river-grove-mutual-water-assn-ca4400621 (data as of October 1, 2026).