States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 093200359

Washoe Tribe Stewart

Gardnerville, EPA Region 9 — Tribal Water Systems 89410 - drinking water served from groundwater sources to 150 people, tracked in EPA SDWIS and UCMR5.

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

150
People served: 148
EPA violations: 1
Health-based: Untested
UCMR5 result

The verdict

EPA records 148 drinking-water violations at Washoe Tribe Stewart, 1% of them health-based.

148
Total EPA violations on record: 1%
Health-based (MCL / treatment failure): 150
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Washoe Tribe Stewart

Washoe Tribe Stewart is a native american-owned community water system that delivers drinking water to 150 residents in Gardnerville, EPA Region 9 — Tribal Water Systems through 53 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 148 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 136 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 Coliform (TCR), recorded in 13 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

150

Total Violations

148

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Native American
Connections: 53
School/Daycare: No
MCL Violations: 0
Monitoring Violations: 136
Treatment Tech Violations: 1

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	13	2013
Nitrate	MR	8	2024
Consumer Confidence Rule	Other	3	2012
Lead and Copper Rule	MR	3	1998
Endrin	MR	2	2001
BHC-GAMMA	MR	2	2001
Methoxychlor	MR	2	2001
Dalapon	MR	2	2001
Endothall	MR	2	2001
Di(2-ethylhexyl) adipate	MR	2	2001
Di(2-ethylhexyl) phthalate	MR	2	2001
OXAMYL	MR	2	2001
Simazine	MR	2	2001
Picloram	MR	2	2001
Dinoseb	MR	2	2001
Hexachlorocyclopentadiene	MR	2	2001
Carbofuran	MR	2	2001
Atrazine	MR	2	2001
2,3,7,8-TCDD	MR	2	2001
Heptachlor	MR	2	2001
Heptachlor epoxide	MR	2	2001
2,4-D	MR	2	2001
2,4,5-TP	MR	2	2001
HEXACHLOROBENZENE	MR	2	2001
Benzo(a)pyrene	MR	2	2001
Pentachlorophenol	MR	2	2001
1,2,4-Trichlorobenzene	MR	2	2011
cis-1,2-Dichloroethylene	MR	2	2011
1,2-DIBROMO-3-CHLOROPROPANE	MR	2	2001
Total Polychlorinated Biphenyls (PCB)	MR	2	2001

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 Washoe Tribe Stewart.

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 093200359 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	Nitrate	MR	8	SDWIS / 093200359 / 1040
2022	Groundwater Rule	TT	1	SDWIS / 093200359 / 0700
2019	Public Notice	Other	1	SDWIS / 093200359 / 7500
2019	Revised Total Coliform Rule	MON	1	SDWIS / 093200359 / 8000
2016	Revised Total Coliform Rule	Other	1	SDWIS / 093200359 / 8000
2013	Coliform (TCR)	MR	13	SDWIS / 093200359 / 3100
2013	Stage 2 Disinfectants and Disinfection Byproducts Rule	MR	1	SDWIS / 093200359 / 0600
2012	Consumer Confidence Rule	Other	3	SDWIS / 093200359 / 7000
2011	1,2,4-Trichlorobenzene	MR	2	SDWIS / 093200359 / 2378
2011	cis-1,2-Dichloroethylene	MR	2	SDWIS / 093200359 / 2380
2011	Xylenes, Total	MR	2	SDWIS / 093200359 / 2955
2011	o-Dichlorobenzene	MR	2	SDWIS / 093200359 / 2968
2011	p-Dichlorobenzene	MR	2	SDWIS / 093200359 / 2969
2011	DICHLOROMETHANE	MR	2	SDWIS / 093200359 / 2964
2011	1,1-Dichloroethylene	MR	2	SDWIS / 093200359 / 2977

How Washoe Tribe Stewart Compares

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

Metric	Washoe Tribe Stewart	EPA Region 9 — Tribal Water Systems avg	Federal benchmark
Total violations	148	-	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	150	-	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 Washoe Tribe Stewart water safe to drink? ▼

Washoe Tribe Stewart (PWS ID: 093200359) has 148 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 150 people using Groundwater sources.

How many people does Washoe Tribe Stewart serve? ▼

Washoe Tribe Stewart serves 150 people in Gardnerville, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 53 service connections.

What type of violations does Washoe Tribe Stewart have? ▼

Washoe Tribe Stewart has 148 total violations: 1 health-based violations (MCL exceedances or treatment failures), 136 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Washoe Tribe Stewart water? ▼

No PFAS testing data is available for Washoe Tribe Stewart under the EPA's UCMR5 monitoring program.

What water source does Washoe Tribe Stewart use? ▼

Washoe Tribe Stewart 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.