Public water system · CA2210003
ActiveDelaware North Parks Services at Tenaya
At a glance
Delaware North Parks Services at Tenaya (PWSID CA2210003) is an active non-transient non-community water system in Mariposa County, California. It reports serving 800 people through 55 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 10 violations for this system; 1 is health-based, and the most recent began in August 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
800
Service connections
55
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Delaware North Parks Services at Tenaya compare with other water systems in Mariposa County?
By EPA's size categories, Delaware North Parks Services at Tenaya is a small system (501 to 3,300 people). Mariposa County has 67 active public water systems. Its population served is about twice the county average of 381 people per system, and accounts for 3.1% of the 25,508 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 Delaware North Parks Services at Tenaya is about 86% 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 Delaware North Parks Services at Tenaya?
EPA lists Delaware North Parks Services at Tenaya 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. 33 of the 67 active systems in Mariposa County (49%) are also privately owned.
Does Delaware North Parks Services at Tenaya have drinking water violations?
EPA's records list 10 violations for this system; 1 is health-based, and the most recent began in August 2010. The violations listed here began between April 1992 and August 2010. By type: 9 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 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 |
|---|---|---|---|---|
| 2010-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2006-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2005-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2002-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2002-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1995-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1992-04-01 | 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.
Delaware North Parks Services at Tenaya: frequently asked questions
Who runs Delaware North Parks Services at Tenaya?
Delaware North Parks Services at Tenaya (PWSID CA2210003) is a non-transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Delaware North Parks Services at Tenaya serve?
Delaware North Parks Services at Tenaya reports serving 800 people through 55 service connections in Mariposa County, California.
Where does Delaware North Parks Services at Tenaya 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 Delaware North Parks Services at Tenaya have any drinking water violations?
EPA's records list 10 violations for this system; 1 is health-based, and the most recent began in August 2010. 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 Delaware North Parks Services at Tenaya'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; 1 is health-based, and the most recent began in August 2010. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Delaware North Parks Services at Tenaya's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Delaware North Parks Services at Tenaya 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 Mariposa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Yosemite Nps-Glacier Point | Mariposa | 4,000 | Transient non-community | Surface water |
| Blm-Briceburg Water System | Mariposa | 3,196 | Transient non-community | Groundwater |
| Mariposa Public Utility Dist | Mariposa | 2,000 | Community | Surface water |
| Yosemite Nps-Bridalveil Fall | Mariposa | 1,163 | Transient non-community | Groundwater |
| Mid - Mc Swain Rec Area | Mariposa | 1,119 | Transient non-community | Surface water |
| Yosemite Nps-Yosemite Valley | Mariposa | 1,000 | 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, “Delaware North Parks Services at Tenaya, PWSID CA2210003, California”, https://aquacensus.com/water-systems/california/delaware-north-parks-services-at-tenaya-ca2210003 (data as of October 1, 2026).