PlainWater
States → EPA Region 9 — Tribal Water Systems

Non-Transient Non-Community Water System · PWS 090400698

Apache Gold Casino

San Carlos, EPA Region 9 — Tribal Water Systems 85550 - drinking water served from groundwater sources to 1,475 people, tracked in EPA SDWIS and UCMR5.

1,475
People served
121
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 121 drinking-water violations at Apache Gold Casino, 1% of them health-based.

121
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
1,475
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Apache Gold Casino

Apache Gold Casino is a native american-owned non-transient non-community water system that delivers drinking water to 1,475 residents in San Carlos, EPA Region 9 — Tribal Water Systems through 68 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 121 total violations for this system , of which 1 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 108 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 38 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
1,475
Total Violations
121
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Native American
Connections
68
School/Daycare
No
MCL Violations
0
Monitoring Violations
108
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 38 2016
Nitrate MR 6 2007
Total Haloacetic Acids (HAA5) MR 3 2007
TTHM MR 3 2007
Arsenic MR 2 2011
HEXACHLOROBENZENE MR 2 2017
Barium MR 1 2001
Cadmium MR 1 2001
Chromium MR 1 2001
Mercury MR 1 2001
Beryllium, Total MR 1 2001
BHC-GAMMA MR 1 2011
Toxaphene MR 1 2011
Diquat MR 1 2011
Endothall MR 1 2011
Glyphosate MR 1 2011
Di(2-ethylhexyl) adipate MR 1 2011
Di(2-ethylhexyl) phthalate MR 1 2011
Dinoseb MR 1 2011
Hexachlorocyclopentadiene MR 1 2011
Heptachlor MR 1 2011
Benzo(a)pyrene MR 1 2011
cis-1,2-Dichloroethylene MR 1 2011
Total Polychlorinated Biphenyls (PCB) MR 1 2011
1,2-DIBROMO-3-CHLOROPROPANE MR 1 2011
Xylenes, Total MR 1 2011
o-Dichlorobenzene MR 1 2011
Vinyl chloride MR 1 2011
1,1-Dichloroethylene MR 1 2011
trans-1,2-Dichloroethylene MR 1 2011

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 Apache Gold Casino.

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 090400698 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 Groundwater Rule TT 1 SDWIS / 090400698 / 0700
2017 HEXACHLOROBENZENE MR 2 SDWIS / 090400698 / 2274
2016 Coliform (TCR) MR 38 SDWIS / 090400698 / 3100
2013 Bromate MR 1 SDWIS / 090400698 / 1011
2011 Arsenic MR 2 SDWIS / 090400698 / 1005
2011 BHC-GAMMA MR 1 SDWIS / 090400698 / 2010
2011 Toxaphene MR 1 SDWIS / 090400698 / 2020
2011 Diquat MR 1 SDWIS / 090400698 / 2032
2011 Endothall MR 1 SDWIS / 090400698 / 2033
2011 Glyphosate MR 1 SDWIS / 090400698 / 2034
2011 Di(2-ethylhexyl) adipate MR 1 SDWIS / 090400698 / 2035
2011 Di(2-ethylhexyl) phthalate MR 1 SDWIS / 090400698 / 2039
2011 Dinoseb MR 1 SDWIS / 090400698 / 2041
2011 Hexachlorocyclopentadiene MR 1 SDWIS / 090400698 / 2042
2011 Heptachlor MR 1 SDWIS / 090400698 / 2065

How Apache Gold Casino Compares

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

Metric Apache Gold Casino EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 121 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,475 - 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 Apache Gold Casino water safe to drink? ▼
Apache Gold Casino (PWS ID: 090400698) has 121 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,475 people using Groundwater sources.
How many people does Apache Gold Casino serve? ▼
Apache Gold Casino serves 1,475 people in San Carlos, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 68 service connections.
What type of violations does Apache Gold Casino have? ▼
Apache Gold Casino has 121 total violations: 1 health-based violations (MCL exceedances or treatment failures), 108 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Apache Gold Casino water? ▼
No PFAS testing data is available for Apache Gold Casino under the EPA's UCMR5 monitoring program.
What water source does Apache Gold Casino use? ▼
Apache Gold Casino uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.