PlainWater
States → EPA Region 9 — Tribal Water Systems

Transient Non-Community Water System · PWS 090400218

San Miguel CBP

Laguna Niguel, EPA Region 9 — Tribal Water Systems 92677 - drinking water served from groundwater sources to 25 people, tracked in EPA SDWIS and UCMR5.

25
People served
79
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 79 drinking-water violations at San Miguel CBP, 4% of them health-based.

79
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
25
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: San Miguel CBP

San Miguel CBP is a federal-owned transient non-community water system that delivers drinking water to 25 residents in Laguna Niguel, EPA Region 9 — Tribal Water Systems through 15 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 79 total violations for this system , of which 3 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 72 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 Arsenic, recorded in 3 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
25
Total Violations
79
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Federal
Connections
15
School/Daycare
No
MCL Violations
3
Monitoring Violations
72
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 3 2016
Revised Total Coliform Rule RPT 3 2025
Dalapon MR 2 2016
Diquat MR 2 2016
Endothall MR 2 2016
Glyphosate MR 2 2016
OXAMYL MR 2 2016
Dinoseb MR 2 2016
Carbofuran MR 2 2016
2,3,7,8-TCDD MR 2 2016
Pentachlorophenol MR 2 2016
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2016
Coliform (TCR) MR 2 2013
2,4-D MR 2 2016
Picloram MR 2 2016
ETHYLENE DIBROMIDE MR 2 2016
Arsenic MR 2 2016
2,4,5-TP MR 2 2016
BHC-GAMMA MR 1 2013
Methoxychlor MR 1 2013
Toxaphene MR 1 2013
Di(2-ethylhexyl) adipate MR 1 2013
Simazine MR 1 2013
Atrazine MR 1 2013
Heptachlor MR 1 2013
LASSO MR 1 2013
Benzo(a)pyrene MR 1 2013
Total Polychlorinated Biphenyls (PCB) MR 1 2013
Xylenes, Total MR 1 2013
1,1-Dichloroethylene MR 1 2013

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 San Miguel CBP.

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 090400218 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 RPT 3 SDWIS / 090400218 / 8000
2017 E. COLI MR 1 SDWIS / 090400218 / 3014
2016 Arsenic MCL 3 SDWIS / 090400218 / 1005
2016 Dalapon MR 2 SDWIS / 090400218 / 2031
2016 Diquat MR 2 SDWIS / 090400218 / 2032
2016 Endothall MR 2 SDWIS / 090400218 / 2033
2016 Glyphosate MR 2 SDWIS / 090400218 / 2034
2016 OXAMYL MR 2 SDWIS / 090400218 / 2036
2016 Dinoseb MR 2 SDWIS / 090400218 / 2041
2016 Carbofuran MR 2 SDWIS / 090400218 / 2046
2016 2,3,7,8-TCDD MR 2 SDWIS / 090400218 / 2063
2016 Pentachlorophenol MR 2 SDWIS / 090400218 / 2326
2016 1,2-DIBROMO-3-CHLOROPROPANE MR 2 SDWIS / 090400218 / 2931
2016 2,4-D MR 2 SDWIS / 090400218 / 2105
2016 Picloram MR 2 SDWIS / 090400218 / 2040

How San Miguel CBP Compares

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

Metric San Miguel CBP EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 79 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 25 - 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 San Miguel CBP water safe to drink? ▼
San Miguel CBP (PWS ID: 090400218) has 79 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 25 people using Groundwater sources.
How many people does San Miguel CBP serve? ▼
San Miguel CBP serves 25 people in Laguna Niguel, EPA Region 9 — Tribal Water Systems. It is a Federal-owned system using Groundwater water sources with 15 service connections.
What type of violations does San Miguel CBP have? ▼
San Miguel CBP has 79 total violations: 3 health-based violations (MCL exceedances or treatment failures), 72 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in San Miguel CBP water? ▼
No PFAS testing data is available for San Miguel CBP under the EPA's UCMR5 monitoring program.
What water source does San Miguel CBP use? ▼
San Miguel CBP uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.