Public water system · 090600056
ActiveLa Posta Lower Community
At a glance
La Posta Lower Community (PWSID 090600056) is an active community water system in California. It reports serving 60 people through 8 service connections. Its primary water source is groundwater, and EPA lists it as Native American-owned. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in August 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
60
Service connections
8
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does La Posta Lower Community compare with other water systems in California?
By EPA's size categories, La Posta Lower Community is a very small system (500 people or fewer). Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so La Posta Lower Community is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. California has 2,997 active 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 La Posta Lower Community?
EPA lists La Posta Lower Community as Native American-owned. The EPA Region 09 is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.
Does La Posta Lower Community have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in August 2024. The violations listed here began between July 2009 and August 2024. By type: 1 monitoring, 1 monitoring and reporting and 1 contaminant level above the legal limit. The contaminants or rules involved are Revised Total Coliform Rule, Chlorine and Nitrate. EPA lists 3 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 |
|---|---|---|---|---|
| 2024-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2009-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
All 3 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.
La Posta Lower Community: frequently asked questions
Who runs La Posta Lower Community?
La Posta Lower Community (PWSID 090600056) is a community water system Native American-owned. It is regulated by the EPA Region 09.
How many people does La Posta Lower Community serve?
La Posta Lower Community reports serving 60 people through 8 service connections in California.
Where does La Posta Lower Community 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 La Posta Lower Community have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in August 2024. 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 La Posta Lower Community'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 3 violations for this system; 1 is health-based, and the most recent began in August 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 09.
Where can I find La Posta Lower Community's water quality report?
As a community water system, La Posta Lower Community must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in California
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Los Angeles-City, Dept. of Water & Power | Los Angeles | 3,875,566 | Community | Surface water |
| East Bay MUD | Alameda | 1,442,800 | Community | Surface water |
| San Diego, City of | San Diego | 1,385,379 | Community | Surface water |
| San Jose Water | Santa Clara | 1,039,920 | Community | Surface water |
| Sfpuc City Distribution Division | San Francisco | 848,019 | Community | Purchased surface water |
| Eastern Municipal Wd | Riverside | 666,581 | Community | Purchased 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, “La Posta Lower Community, PWSID 090600056, California”, https://aquacensus.com/water-systems/california/la-posta-lower-community-090600056 (data as of October 1, 2026).