TRI-COUNTY RWD #2

Q: Is TRI-COUNTY RWD #2 water safe to drink?

TRI-COUNTY RWD #2 (PWS ID: OK2006362) has 167 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 3 PFAS compounds found. This system serves 5,172 people using Groundwater sources.

Q: What type of violations does TRI-COUNTY RWD #2 have?

TRI-COUNTY RWD #2 has 167 total violations: 14 health-based violations (MCL exceedances or treatment failures), 144 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Q: Has PFAS been detected in TRI-COUNTY RWD #2 water?

Yes. UCMR5 testing detected 3 PFAS compounds in TRI-COUNTY RWD #2's water supply: lithium, PFHxS, PFOS. PFAS are persistent "forever chemicals" that do not break down in the environment.

Q: What water source does TRI-COUNTY RWD #2 use?

TRI-COUNTY RWD #2 uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Q: 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.

Reviewed byPlainWater Editorial, Drinking Water Quality Editorial Team · June 4, 2026

PWS ID: OK2006362 · EARLSBORO, Oklahoma 74840

TRI-COUNTY RWD #2 serves 5,172 people in EARLSBORO, Oklahoma using Groundwater water sources. It has 167 recorded EPA violations, including 14 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (3 compounds found).

Water Quality Snapshot: TRI-COUNTY RWD #2

TRI-COUNTY RWD #2 is a local-owned community water system that delivers drinking water to 5,172 residents in EARLSBORO, Oklahoma (Pottawatomie County) through 2,332 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 167 total violations for this system , of which 14 (8%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 144 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 48 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 3 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 17 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Oklahoma, EPA tracks 1,262 public water systems serving 3,699,452 people, with 336,706 cumulative violations and 113,804 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 266.8 violations. TRI-COUNTY RWD #2's 167 violations sit below the Oklahoma average. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%). 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

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

Population Served

5,172

Total Violations

167

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Local
Connections: 2,332
County: Pottawatomie
School/Daycare: No
MCL Violations: 12
Monitoring Violations: 144
Treatment Tech Violations: 2

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	48	2013
Coliform (TCR)	MCL	12	2013
Lead and Copper Rule	MR	9	2011
Nitrate-Nitrite	MR	7	2024
E. COLI	MR	6	2017
Arsenic	MR	6	2011
Chromium	MR	4	2011
Nickel	MR	4	2011
Gross Alpha, Excl. Radon and U	MR	4	2008
Combined Uranium	MR	4	2008
Gross Beta Particle Activity	MR	4	2008
Fluoride	MR	4	2011
Combined Radium (-226 and -228)	MR	4	2008
Revised Total Coliform Rule	MON	4	2021
Consumer Confidence Rule	Other	4	2016
Beryllium, Total	MR	4	2011
Cadmium	MR	4	2011
Chlorine	MR	4	2021
Barium	MR	4	2011
CYANIDE	MR	4	2011
Mercury	MR	4	2011
Thallium, Total	MR	4	2011
Antimony, Total	MR	4	2011
Selenium	MR	4	2011
LEAD AND COPPER RULE REVISIONS	TT	2	2024
LEAD AND COPPER RULE REVISIONS	RPT	2	2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 180 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
NFDHA	4/14/2025	<0.02 µg/L	0.02 µg/L	Not Detected
PFTA	4/14/2025	<0.008 µg/L	0.008 µg/L	Not Detected
PFPeS	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFEESA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFMPA	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
4:2 FTS	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFTrDA	4/14/2025	<0.007 µg/L	0.007 µg/L	Not Detected
NEtFOSAA	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
NMeFOSAA	4/14/2025	<0.006 µg/L	0.006 µg/L	Not Detected
6:2 FTS	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFHpS	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
lithium	4/14/2025	17.0000 µg/L	9 µg/L	Detected
PFDoA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
11Cl-PF3OUdS	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
9Cl-PF3ONS	4/14/2025	<0.002 µg/L	0.002 µg/L	Not Detected
ADONA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
HFPO-DA	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
8:2 FTS	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFUnA	4/14/2025	<0.002 µg/L	0.002 µg/L	Not Detected
PFBA	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFBS	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFDA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFOA	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFNA	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFHxS	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpS	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
ADONA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
9Cl-PF3ONS	4/14/2025	<0.002 µg/L	0.002 µg/L	Not Detected
11Cl-PF3OUdS	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFUnA	4/14/2025	<0.002 µg/L	0.002 µg/L	Not Detected
PFHxA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFDA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFOA	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFPeS	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFNA	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
6:2 FTS	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
PFBS	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxS	4/14/2025	0.0220 µg/L	0.003 µg/L	Detected
PFHpA	4/14/2025	<0.003 µg/L	0.003 µg/L	Not Detected
PFOS	4/14/2025	<0.004 µg/L	0.004 µg/L	Not Detected
PFTA	4/14/2025	<0.008 µg/L	0.008 µg/L	Not Detected
PFBA	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
HFPO-DA	4/14/2025	<0.005 µg/L	0.005 µg/L	Not Detected
NMeFOSAA	4/14/2025	<0.006 µg/L	0.006 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 TRI-COUNTY RWD #2.

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 OK2006362 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oklahoma Drinking Water Authority

Oklahoma'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 OK 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-Nitrite	MR	7	SDWIS / OK2006362 / 1038
2024	LEAD AND COPPER RULE REVISIONS	TT	2	SDWIS / OK2006362 / 5200
2024	LEAD AND COPPER RULE REVISIONS	RPT	2	SDWIS / OK2006362 / 5200
2021	Revised Total Coliform Rule	MON	4	SDWIS / OK2006362 / 8000
2021	Chlorine	MR	4	SDWIS / OK2006362 / 0999
2017	E. COLI	MR	6	SDWIS / OK2006362 / 3014
2016	Consumer Confidence Rule	Other	4	SDWIS / OK2006362 / 7000
2013	Coliform (TCR)	MR	48	SDWIS / OK2006362 / 3100
2013	Coliform (TCR)	MCL	12	SDWIS / OK2006362 / 3100
2011	Lead and Copper Rule	MR	9	SDWIS / OK2006362 / 5000
2011	Arsenic	MR	6	SDWIS / OK2006362 / 1005
2011	Chromium	MR	4	SDWIS / OK2006362 / 1020
2011	Nickel	MR	4	SDWIS / OK2006362 / 1036
2011	Fluoride	MR	4	SDWIS / OK2006362 / 1025
2011	Beryllium, Total	MR	4	SDWIS / OK2006362 / 1075

How TRI-COUNTY RWD #2 Compares

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

Metric	TRI-COUNTY RWD #2	Oklahoma avg	Federal benchmark
Total violations	167	266.8	SDWA compliance — any non-zero count is a recorded breach
Health-based violations	14	90.2	Indicates a contaminant exceeded a federal MCL
PFAS detection	3 compounds	60.8%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	5,172	2,931	Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,262 regulated public water systems in Oklahoma.

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 TRI-COUNTY RWD #2 water safe to drink? ▼

TRI-COUNTY RWD #2 (PWS ID: OK2006362) has 167 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 3 PFAS compounds found. This system serves 5,172 people using Groundwater sources.

How many people does TRI-COUNTY RWD #2 serve? ▼

TRI-COUNTY RWD #2 serves 5,172 people in EARLSBORO, Oklahoma. It is a Local-owned system using Groundwater water sources with 2,332 service connections.

What type of violations does TRI-COUNTY RWD #2 have? ▼

TRI-COUNTY RWD #2 has 167 total violations: 14 health-based violations (MCL exceedances or treatment failures), 144 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in TRI-COUNTY RWD #2 water? ▼

Yes. UCMR5 testing detected 3 PFAS compounds in TRI-COUNTY RWD #2's water supply: lithium, PFHxS, PFOS. PFAS are persistent "forever chemicals" that do not break down in the environment.

What water source does TRI-COUNTY RWD #2 use? ▼

TRI-COUNTY RWD #2 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.

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