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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090605121

Arviso - Mobile Home Park

Pauma Valley, EPA Region 9 — Tribal Water Systems 92061 - drinking water served from groundwater sources to 70 people, tracked in EPA SDWIS and UCMR5.

70
People served
173
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 173 drinking-water violations at Arviso - Mobile Home Park, 2% of them health-based.

173
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
70
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Arviso - Mobile Home Park

Arviso - Mobile Home Park is a private-owned community water system that delivers drinking water to 70 residents in Pauma Valley, EPA Region 9 — Tribal Water Systems through 37 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 173 total violations for this system , of which 4 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 129 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 19 violations (MR). 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
70
Total Violations
173
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
37
School/Daycare
No
MCL Violations
3
Monitoring Violations
129
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 19 2012
Revised Total Coliform Rule MON 15 2025
Public Notice Other 9 2024
Nitrate MR 8 2024
Revised Total Coliform Rule RPT 8 2025
Carbofuran MR 3 2001
Pentachlorophenol MR 3 2001
Coliform (TCR) MCL 3 2004
Consumer Confidence Rule Other 3 2002
Asbestos MR 2 1998
Endrin MR 2 2001
Diquat MR 2 2001
Simazine MR 2 2001
Atrazine MR 2 1998
Heptachlor epoxide MR 2 2001
1,2-DIBROMO-3-CHLOROPROPANE MR 2 1998
ETHYLENE DIBROMIDE MR 2 1998
p-Dichlorobenzene MR 2 2001
Tetrachloroethylene MR 2 2001
Styrene MR 2 2001
E. COLI MR 2 2025
1,2,4-Trichlorobenzene MR 2 2001
Mercury MR 2 2001
LASSO MR 2 1998
Nitrite MR 2 1998
1,1,1-Trichloroethane MR 2 2001
Chromium MR 1 1998
Arsenic MR 1 1998
Barium MR 1 1998
Cadmium MR 1 1998

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 Arviso - 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 090605121 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
2025 Revised Total Coliform Rule MON 15 SDWIS / 090605121 / 8000
2025 Revised Total Coliform Rule RPT 8 SDWIS / 090605121 / 8000
2025 E. COLI MR 2 SDWIS / 090605121 / 3014
2024 Public Notice Other 9 SDWIS / 090605121 / 7500
2024 Nitrate MR 8 SDWIS / 090605121 / 1040
2019 Revised Total Coliform Rule TT 1 SDWIS / 090605121 / 8000
2017 Lead and Copper Rule MR 1 SDWIS / 090605121 / 5000
2012 Coliform (TCR) MR 19 SDWIS / 090605121 / 3100
2004 Coliform (TCR) MCL 3 SDWIS / 090605121 / 3100
2002 Consumer Confidence Rule Other 3 SDWIS / 090605121 / 7000
2001 Carbofuran MR 3 SDWIS / 090605121 / 2046
2001 Pentachlorophenol MR 3 SDWIS / 090605121 / 2326
2001 Endrin MR 2 SDWIS / 090605121 / 2005
2001 Diquat MR 2 SDWIS / 090605121 / 2032
2001 Simazine MR 2 SDWIS / 090605121 / 2037

How Arviso - Mobile Home Park Compares

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

Metric Arviso - Mobile Home Park EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 173 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 70 - 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 Arviso - Mobile Home Park water safe to drink? ▼
Arviso - Mobile Home Park (PWS ID: 090605121) has 173 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 70 people using Groundwater sources.
How many people does Arviso - Mobile Home Park serve? ▼
Arviso - Mobile Home Park serves 70 people in Pauma Valley, EPA Region 9 — Tribal Water Systems. It is a Private-owned system using Groundwater water sources with 37 service connections.
What type of violations does Arviso - Mobile Home Park have? ▼
Arviso - Mobile Home Park has 173 total violations: 4 health-based violations (MCL exceedances or treatment failures), 129 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Arviso - Mobile Home Park water? ▼
No PFAS testing data is available for Arviso - Mobile Home Park under the EPA's UCMR5 monitoring program.
What water source does Arviso - Mobile Home Park use? ▼
Arviso - 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.