Public water system · CA1503219

Active

Hasson O S

At a glance

Hasson O S (PWSID CA1503219) is an active transient non-community water system in Kern County, California. It reports serving 40 people through 3 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in August 2021.

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

Population served

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDCA1503219

System typeTransient non-community water system

Activity statusActive

Population served40

Service connections3

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyCA state drinking water program

City served—

StateCalifornia

ZIP—

CountyKern County

How does Hasson O S compare with other water systems in Kern County?

By EPA's size categories, Hasson O S is a very small system (500 people or fewer). Kern County has 327 active public water systems. Its population served is well below the county average of 3,140 people per system, and accounts for less than 0.1% of the 1,026,649 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Hasson O S is well below that figure.

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

A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. California has 3,016 active transient non-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 Hasson O S?

EPA lists Hasson O S 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. 263 of the 327 active systems in Kern County (80%) are also privately owned.

Does Hasson O S have drinking water violations?

EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in August 2021. The violations listed here began between October 1994 and August 2021. By type: 5 contaminant level above the legal limit, 4 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Nitrate (5 of them). EPA lists 10 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
2021-08-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
2011-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
2011-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01	Nitratecode 1040	Yes	Resolved
2011-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
2001-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1996-03-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1995-12-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1995-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1994-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved

All 10 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.

Hasson O S: frequently asked questions

Who runs Hasson O S?

Hasson O S (PWSID CA1503219) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.

How many people does Hasson O S serve?

Hasson O S reports serving 40 people through 3 service connections in Kern County, California.

Where does Hasson O S 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 Hasson O S have any drinking water violations?

EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in August 2021. 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 Hasson O 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 10 violations for this system; 5 are health-based, and the most recent began in August 2021. For current results, consult EPA ECHO, or the CA state drinking water program.

Where can I find Hasson O S' water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Hasson O S is a 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 Kern County

Water system	County	Population served	Type	Source
Cws - Bakersfield	Kern	267,881	Community	Surface water
Bakersfield, City of	Kern	160,144	Community	Purchased surface water
Delano, City of	Kern	51,428	Community	Groundwater
Oildale Mwc	Kern	44,899	Community	Purchased surface water
Indian Wells Valley W.D.	Kern	41,580	Community	Groundwater
Tejon Castac Wd - I5 & Laval Rd	Kern	38,125	Community	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, “Hasson O S, PWSID CA1503219, California”, https://aquacensus.com/water-systems/california/hasson-o-s-ca1503219 (data as of October 1, 2026).