Public water system · CA3510501
ActivePinnacles National Park-East District
At a glance
Pinnacles National Park-East District (PWSID CA3510501) is an active transient non-community water system in San Benito County, California. It reports serving 1,811 people through 22 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 October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,811
Service connections
22
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Pinnacles National Park-East District compare with other water systems in San Benito County?
By EPA's size categories, Pinnacles National Park-East District is a small system (501 to 3,300 people). San Benito County has 63 active public water systems. Its population served is about 38% above the county average of 1,312 people per system, and accounts for 2.2% of the 82,670 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 Pinnacles National Park-East District is about 13 times 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 Pinnacles National Park-East District?
EPA lists Pinnacles National Park-East District 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. 3 of the 63 active systems in San Benito County (4.8%) are also owned by the federal government.
Does Pinnacles National Park-East District have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2025. The violations listed here began between March 2003 and October 2025. By type: 4 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (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 |
|---|---|---|---|---|
| 2025-10-27 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Unaddressed |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2005-08-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-03-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | 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.
Pinnacles National Park-East District: frequently asked questions
Who runs Pinnacles National Park-East District?
Pinnacles National Park-East District (PWSID CA3510501) is a transient non-community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Pinnacles National Park-East District serve?
Pinnacles National Park-East District reports serving 1,811 people through 22 service connections in San Benito County, California.
Where does Pinnacles National Park-East District 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 Pinnacles National Park-East District have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 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 Pinnacles National Park-East District'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 October 2025. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Pinnacles National Park-East District's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Pinnacles National Park-East District 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 San Benito County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hollister, City of | San Benito | 26,017 | Community | Purchased surface water |
| Sunnyslope County Water Dist | San Benito | 24,954 | Community | Purchased surface water |
| 33rd District Agricultural Association | San Benito | 9,000 | Transient non-community | Groundwater |
| San Benito High School | San Benito | 3,310 | Non-transient non-community | Groundwater |
| Aromas Water District | San Benito | 2,988 | Community | Groundwater |
| San Juan Bautista, City of | San Benito | 2,335 | 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, “Pinnacles National Park-East District, PWSID CA3510501, California”, https://aquacensus.com/water-systems/california/pinnacles-national-park-east-district-ca3510501 (data as of October 1, 2026).