Public water system · CA5400713

Active

Oak Valley School

At a glance

Oak Valley School (PWSID CA5400713) is an active non-transient non-community water system in Tulare County, California. It reports serving 645 people through 10 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in January 2023.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

645

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDCA5400713

System typeNon-transient non-community water system

Activity statusActive

Population served645

Service connections10

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyCA state drinking water program

City served—

StateCalifornia

ZIP—

CountyTulare County

How does Oak Valley School compare with other water systems in Tulare County?

By EPA's size categories, Oak Valley School is a small system (501 to 3,300 people). Tulare County has 274 active public water systems. Its population served is about 62% below the county average of 1,700 people per system, and accounts for 0.1% of the 465,710 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Oak Valley School is about 50% above that figure.

What does “non-transient non-community water system” mean?

A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. California has 1,466 active non-transient non-community water systems, 20% 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 Oak Valley School?

EPA lists Oak Valley School as owned by a local 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. 66 of the 274 active systems in Tulare County (24%) are also owned by a local government.

Does Oak Valley School have drinking water violations?

Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in January 2023. The violations listed here began between July 2012 and January 2023. By type: 8 contaminant level above the legal limit, 3 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Arsenic (8 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
2023-01-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2020-07-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2015-06-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2014-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2014-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2012-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2012-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2012-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	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.

Oak Valley School: frequently asked questions

Who runs Oak Valley School?

Oak Valley School (PWSID CA5400713) is a non-transient non-community water system owned by a local government. It is regulated by the CA state drinking water program.

How many people does Oak Valley School serve?

Oak Valley School reports serving 645 people through 10 service connections in Tulare County, California.

Where does Oak Valley School 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 Oak Valley School have any drinking water violations?

Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in January 2023. 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 Oak Valley School'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, 8 are health-based, and the most recent began in January 2023. For current results, consult EPA ECHO, or the CA state drinking water program.

Where can I find Oak Valley School's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Oak Valley School is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Tulare County

Water system	County	Population served	Type	Source
Cws - Visalia	Tulare	148,496	Community	Groundwater
Tulare, City of	Tulare	72,241	Community	Groundwater
Porterville, City of	Tulare	63,487	Community	Groundwater
Dinuba, City of	Tulare	27,281	Community	Groundwater
Lindsay, City of	Tulare	12,659	Community	Surface water
Exeter, City of	Tulare	11,169	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, “Oak Valley School, PWSID CA5400713, California”, https://aquacensus.com/water-systems/california/oak-valley-school-ca5400713 (data as of October 1, 2026).