Public water system · CA1400037
ActiveLone Pine Oasis
At a glance
Lone Pine Oasis (PWSID CA1400037) is an active transient non-community water system in Inyo County, California. It reports serving 49 people through 48 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
49
Service connections
48
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Lone Pine Oasis compare with other water systems in Inyo County?
By EPA's size categories, Lone Pine Oasis is a very small system (500 people or fewer). Inyo County has 112 active public water systems. Its population served is well below the county average of 442 people per system, and accounts for less than 0.1% of the 49,451 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 Lone Pine Oasis is about 66% 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 Lone Pine Oasis?
EPA lists Lone Pine Oasis 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. 61 of the 112 active systems in Inyo County (54%) are also privately owned.
Does Lone Pine Oasis have drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2022. The violations listed here began between October 2017 and October 2022. By type: 11 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Combined Uranium (6 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 |
|---|---|---|---|---|
| 2022-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2020-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2020-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2019-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2019-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2018-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2018-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2018-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2018-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2017-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2017-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | 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.
Lone Pine Oasis: frequently asked questions
Who runs Lone Pine Oasis?
Lone Pine Oasis (PWSID CA1400037) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Lone Pine Oasis serve?
Lone Pine Oasis reports serving 49 people through 48 service connections in Inyo County, California.
Where does Lone Pine Oasis 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 Lone Pine Oasis have any drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2022. 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 Lone Pine Oasis' 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, 11 are health-based, and the most recent began in October 2022. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Lone Pine Oasis' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Lone Pine Oasis 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 Inyo County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Bishop Creek Chevron | Inyo | 16,793 | Transient non-community | Groundwater |
| Bishop, City of | Inyo | 3,819 | Community | Groundwater |
| Petite Pantry | Inyo | 3,012 | Transient non-community | Groundwater |
| Lee'S Frontier | Inyo | 2,000 | Transient non-community | Groundwater |
| Inyo County PWD - Lone Pine | Inyo | 1,835 | Community | Purchased groundwater |
| Pearsonville Water System | Inyo | 1,515 | Transient non-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, “Lone Pine Oasis, PWSID CA1400037, California”, https://aquacensus.com/water-systems/california/lone-pine-oasis-ca1400037 (data as of October 1, 2026).