PlainWater
States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090605129

Oasis Mobile Home Park

Thermal, EPA Region 9 — Tribal Water Systems 92274 - drinking water served from groundwater sources to 1,350 people, tracked in EPA SDWIS and UCMR5.

1,350
People served
564
EPA violations
59
Health-based
Untested
UCMR5 result

The verdict

EPA records 564 drinking-water violations at Oasis Mobile Home Park, 10% of them health-based.

564
Total EPA violations on record
10%
Health-based (MCL / treatment failure)
1,350
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Oasis Mobile Home Park

Oasis Mobile Home Park is a private-owned community water system that delivers drinking water to 1,350 residents in Thermal, EPA Region 9 — Tribal Water Systems through 352 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 564 total violations for this system , of which 59 (10%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 292 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Arsenic, recorded in 51 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 9 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
1,350
Total Violations
564
Health-Based Violations
59
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
352
School/Daycare
No
MCL Violations
56
Monitoring Violations
292
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 51 2022
Public Notice Other 33 2022
Coliform (TCR) MR 32 2015
Revised Total Coliform Rule MON 17 2020
Nitrate MR 11 2022
Gross Alpha, Excl. Radon and U MR 6 2021
Revised Total Coliform Rule RPT 6 2024
Arsenic MR 5 2019
Diquat MR 5 2021
2,3,7,8-TCDD MR 5 2021
Total Haloacetic Acids (HAA5) MR 5 2022
Consumer Confidence Rule Other 5 2009
Coliform (TCR) MCL 5 2007
Dalapon MR 4 2021
Endothall MR 4 2021
OXAMYL MR 4 2021
Picloram MR 4 2021
Dinoseb MR 4 2021
Carbofuran MR 4 2021
2,4-D MR 4 2021
2,4,5-TP MR 4 2021
1,2,4-Trichlorobenzene MR 4 2022
Pentachlorophenol MR 4 2021
1,2-DIBROMO-3-CHLOROPROPANE MR 4 2021
ETHYLENE DIBROMIDE MR 4 2021
Xylenes, Total MR 4 2022
DICHLOROMETHANE MR 4 2022
o-Dichlorobenzene MR 4 2022
p-Dichlorobenzene MR 4 2022
Vinyl chloride MR 4 2022

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Oasis Mobile Home Park.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID 090605129 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 9 — Tribal Water Systems Drinking Water Authority

EPA Region 9 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 09 regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Revised Total Coliform Rule RPT 6 SDWIS / 090605129 / 8000
2023 Chlorine MR 3 SDWIS / 090605129 / 0999
2022 Arsenic MCL 51 SDWIS / 090605129 / 1005
2022 Public Notice Other 33 SDWIS / 090605129 / 7500
2022 Nitrate MR 11 SDWIS / 090605129 / 1040
2022 Total Haloacetic Acids (HAA5) MR 5 SDWIS / 090605129 / 2456
2022 1,2,4-Trichlorobenzene MR 4 SDWIS / 090605129 / 2378
2022 Xylenes, Total MR 4 SDWIS / 090605129 / 2955
2022 DICHLOROMETHANE MR 4 SDWIS / 090605129 / 2964
2022 o-Dichlorobenzene MR 4 SDWIS / 090605129 / 2968
2022 p-Dichlorobenzene MR 4 SDWIS / 090605129 / 2969
2022 Vinyl chloride MR 4 SDWIS / 090605129 / 2976
2022 1,1-Dichloroethylene MR 4 SDWIS / 090605129 / 2977
2022 trans-1,2-Dichloroethylene MR 4 SDWIS / 090605129 / 2979
2022 1,2-Dichloroethane MR 4 SDWIS / 090605129 / 2980

How Oasis Mobile Home Park Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Oasis Mobile Home Park EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 564 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 59 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,350 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 9 — Tribal Water Systems.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Oasis Mobile Home Park water safe to drink? ▼
Oasis Mobile Home Park (PWS ID: 090605129) has 564 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,350 people using Groundwater sources.
How many people does Oasis Mobile Home Park serve? ▼
Oasis Mobile Home Park serves 1,350 people in Thermal, EPA Region 9 — Tribal Water Systems. It is a Private-owned system using Groundwater water sources with 352 service connections.
What type of violations does Oasis Mobile Home Park have? ▼
Oasis Mobile Home Park has 564 total violations: 59 health-based violations (MCL exceedances or treatment failures), 292 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Oasis Mobile Home Park water? ▼
No PFAS testing data is available for Oasis Mobile Home Park under the EPA's UCMR5 monitoring program.
What water source does Oasis Mobile Home Park use? ▼
Oasis Mobile Home Park uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.