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SCUA Upper Seven Mile

PWS ID: 090400114 · San Carlos, 09 85550

SCUA Upper Seven Mile serves 8,478 people in San Carlos, 09 using Groundwater water sources. It has 659 recorded EPA violations, including 89 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (2 compounds found).

Water Quality Snapshot: SCUA Upper Seven Mile

SCUA Upper Seven Mile is a native american-owned community water system that delivers drinking water to 8,478 residents in San Carlos, 09 through 1,776 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 659 total violations for this system , of which 89 (14%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 443 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 146 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 2 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 72.8 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across 09, EPA tracks 323 public water systems serving 555,721 people, with 48,296 cumulative violations and 3,354 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 149.5 violations. SCUA Upper Seven Mile's 659 violations sit above the 09 average. Statewide, 30 of 41 UCMR5-tested systems have reported PFAS detections (73.2%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

2 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
8,478
Total Violations
659
Health-Based Violations
89
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
1,776
School/Daycare
No
MCL Violations
72
Monitoring Violations
443
Treatment Tech Violations
17

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 146 2016
Public Notice Other 52 2024
Coliform (TCR) MCL 37 2016
Arsenic MR 35 2024
E. COLI MR 30 2022
Arsenic MCL 27 2016
Consumer Confidence Rule Other 17 2022
Gross Alpha, Excl. Radon and U MR 12 2024
Groundwater Rule TT 12 2023
Revised Total Coliform Rule RPT 12 2023
Chlorine MR 11 2025
Nitrate MR 10 2019
Combined Uranium MR 10 2024
Combined Radium (-226 and -228) MR 10 2024
Revised Total Coliform Rule MCL 8 2023
Revised Total Coliform Rule MON 8 2024
Total Polychlorinated Biphenyls (PCB) MR 5 2024
Revised Total Coliform Rule TT 5 2023
Lead and Copper Rule MR 5 2008
BHC-GAMMA MR 4 2024
Methoxychlor MR 4 2024
Toxaphene MR 4 2024
Carbofuran MR 4 2024
Atrazine MR 4 2024
LASSO MR 4 2024
Heptachlor MR 4 2024
Heptachlor epoxide MR 4 2024
2,4-D MR 4 2024
2,4,5-TP MR 4 2024
Pentachlorophenol MR 4 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 16 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
PFBA 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/8/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFMBA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 7/8/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 7/8/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFHpS 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 7/8/2025 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
lithium 7/8/2025 34.7000 µg/L 9 µg/L Detected
PFHpA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 7/8/2025 0.0297 µg/L 0.003 µg/L Detected
PFHxS 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 7/8/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFOA 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 7/8/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFPeA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
lithium 7/8/2025 69.4000 µg/L 9 µg/L Detected
PFNA 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFTrDA 7/8/2025 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 7/8/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFHxA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 7/8/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/8/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 7/8/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 7/8/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 7/8/2025 <0.008 µg/L 0.008 µg/L Not Detected
6:2 FTS 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected

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 SCUA Upper Seven Mile.

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 090400114 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

09 Drinking Water Authority

09'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 Chlorine MR 11 SDWIS / 090400114 / 0999
2024 Public Notice Other 52 SDWIS / 090400114 / 7500
2024 Arsenic MR 35 SDWIS / 090400114 / 1005
2024 Gross Alpha, Excl. Radon and U MR 12 SDWIS / 090400114 / 4000
2024 Combined Uranium MR 10 SDWIS / 090400114 / 4006
2024 Combined Radium (-226 and -228) MR 10 SDWIS / 090400114 / 4010
2024 Revised Total Coliform Rule MON 8 SDWIS / 090400114 / 8000
2024 Total Polychlorinated Biphenyls (PCB) MR 5 SDWIS / 090400114 / 2383
2024 BHC-GAMMA MR 4 SDWIS / 090400114 / 2010
2024 Methoxychlor MR 4 SDWIS / 090400114 / 2015
2024 Toxaphene MR 4 SDWIS / 090400114 / 2020
2024 Carbofuran MR 4 SDWIS / 090400114 / 2046
2024 Atrazine MR 4 SDWIS / 090400114 / 2050
2024 LASSO MR 4 SDWIS / 090400114 / 2051
2024 Heptachlor MR 4 SDWIS / 090400114 / 2065

How SCUA Upper Seven Mile Compares

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

Metric SCUA Upper Seven Mile 09 avg Federal benchmark
Total violations 659 149.5 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 89 10.4 Indicates a contaminant exceeded a federal MCL
PFAS detection 2 compounds 73.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 8,478 1,720 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 323 regulated public water systems in 09.

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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is SCUA Upper Seven Mile water safe to drink? ▼
SCUA Upper Seven Mile (PWS ID: 090400114) has 659 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 2 PFAS compounds found. This system serves 8,478 people using Groundwater sources.
How many people does SCUA Upper Seven Mile serve? ▼
SCUA Upper Seven Mile serves 8,478 people in San Carlos, 09. It is a Native American-owned system using Groundwater water sources with 1,776 service connections.
What type of violations does SCUA Upper Seven Mile have? ▼
SCUA Upper Seven Mile has 659 total violations: 89 health-based violations (MCL exceedances or treatment failures), 443 monitoring/reporting violations, and 17 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SCUA Upper Seven Mile water? ▼
Yes. UCMR5 testing detected 2 PFAS compounds in SCUA Upper Seven Mile's water supply: lithium, PFBS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does SCUA Upper Seven Mile use? ▼
SCUA Upper Seven Mile 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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

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

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial