Public water system · CA1010501
ActiveNps-Grant Grove
At a glance
Nps-Grant Grove (PWSID CA1010501) is an active community water system in Fresno County, California. It reports serving 2,950 people through 100 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,950
Service connections
100
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Nps-Grant Grove compare with other water systems in Fresno County?
By EPA's size categories, Nps-Grant Grove is a small system (501 to 3,300 people). Fresno County has 328 active public water systems. Its population served is roughly in line with the county average of 3,205 people per system, and accounts for 0.3% of the 1,051,276 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 Nps-Grant Grove is about 56% 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 Nps-Grant Grove?
EPA lists Nps-Grant Grove as owned by the federal 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. 14 of the 328 active systems in Fresno County (4.3%) are also owned by the federal government.
Does Nps-Grant Grove have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2025. The violations listed here began between January 2000 and July 2025. By type: 3 monitoring and reporting and 1 reporting. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 3 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2018-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-07-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
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.
Nps-Grant Grove: frequently asked questions
Who runs Nps-Grant Grove?
Nps-Grant Grove (PWSID CA1010501) is a community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Nps-Grant Grove serve?
Nps-Grant Grove reports serving 2,950 people through 100 service connections in Fresno County, California.
Where does Nps-Grant Grove 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 Nps-Grant Grove have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2025. 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 Nps-Grant Grove'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 July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Nps-Grant Grove's water quality report?
As a community water system, Nps-Grant Grove 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 Fresno County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Fresno | Fresno | 545,716 | Community | Surface water |
| City of Clovis | Fresno | 130,130 | Community | Surface water |
| California State University Fresno | Fresno | 41,000 | Community | Groundwater |
| Cws - Selma | Fresno | 26,517 | Community | Groundwater |
| City of Sanger | Fresno | 26,357 | Community | Groundwater |
| Reedley, City of | Fresno | 26,076 | 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, “Nps-Grant Grove, PWSID CA1010501, California”, https://aquacensus.com/water-systems/california/nps-grant-grove-ca1010501 (data as of October 1, 2026).