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Community Water System · PWS MS0580004

Oak Hill Water Assn

Pontotoc, Mississippi 38863 - drinking water served from groundwater sources to 4,739 people, tracked in EPA SDWIS and UCMR5.

4,739
People served
465
EPA violations
7
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 465 drinking-water violations at Oak Hill Water Assn, 2% of them health-based - above the Mississippi per-system average.

465
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
4,739
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Oak Hill Water Assn

Oak Hill Water Assn is a public/private-owned community water system that delivers drinking water to 4,739 residents in Pontotoc, Mississippi (Pontotoc County) through 1,795 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 465 total violations for this system , of which 7 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 451 monitoring and reporting violations are on file. The most recent violation on record dates to 2015.

The most frequently cited contaminant at this system is Combined Uranium, recorded in 145 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Mississippi, EPA tracks 1,185 public water systems serving 3,286,781 people, with 499,292 cumulative violations and 10,292 health-based violations on record. About 96% of systems in the state carry at least one violation, and state-wide the average per system is 421.3 violations. Statewide, 160 of 238 UCMR5-tested systems have reported PFAS detections (67.2%).

Oak Hill Water Assn's 465 violations sit above the Mississippi average.

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
4,739
Total Violations
465
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Public/Private
Connections
1,795
County
Pontotoc
School/Daycare
No
MCL Violations
7
Monitoring Violations
451
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Uranium MR 145 2012
Gross Alpha, Excl. Radon and U MR 77 2008
Combined Radium (-226 and -228) MR 77 2008
Radium-226 MR 72 2012
Radium-228 MR 72 2012
Coliform (TCR) MCL 7 2015
Coliform (TCR) MR 4 2012
Chlorine MR 4 2012
Consumer Confidence Rule Other 1 2004
Public Notice Other 1 2008

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 232 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
ADONA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 6/17/2024 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
PFUnA 6/17/2024 <2.00 ppt 2.00 ppt Not Detected
PFHxA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFDoA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxS 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFBA 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
PFBS 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
PFOS 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
PFMPA 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
PFTA 6/17/2024 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 6/17/2024 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 6/17/2024 <6.00 ppt 6.00 ppt Not Detected
PFPeS 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
NFDHA 6/17/2024 <20.00 ppt 20.00 ppt Not Detected
PFEESA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpS 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
PFNA 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
PFMBA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 6/17/2024 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 6/17/2024 <7.00 ppt 7.00 ppt Not Detected
PFBS 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpS 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFPeS 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
NFDHA 6/17/2024 <20.00 ppt 20.00 ppt Not Detected
PFHpA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFMPA 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
PFTA 6/17/2024 <8.00 ppt 8.00 ppt Not Detected
PFEESA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 6/17/2024 <2.00 ppt 2.00 ppt Not Detected
6:2 FTS 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/17/2024 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/17/2024 <4.00 ppt 4.00 ppt Not Detected
ADONA 6/17/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxS 6/17/2024 <3.00 ppt 3.00 ppt 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 Oak Hill Water Assn.

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 MS0580004 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Mississippi Drinking Water Authority

Mississippi'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 MS 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
2015 Coliform (TCR) MCL 7 SDWIS / MS0580004 / 3100
2012 Combined Uranium MR 145 SDWIS / MS0580004 / 4006
2012 Radium-226 MR 72 SDWIS / MS0580004 / 4020
2012 Radium-228 MR 72 SDWIS / MS0580004 / 4030
2012 Coliform (TCR) MR 4 SDWIS / MS0580004 / 3100
2012 Chlorine MR 4 SDWIS / MS0580004 / 0999
2008 Gross Alpha, Excl. Radon and U MR 77 SDWIS / MS0580004 / 4000
2008 Combined Radium (-226 and -228) MR 77 SDWIS / MS0580004 / 4010
2008 Public Notice Other 1 SDWIS / MS0580004 / 7500
2004 Consumer Confidence Rule Other 1 SDWIS / MS0580004 / 7000

How Oak Hill Water Assn Compares

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

Metric Oak Hill Water Assn Mississippi avg Federal benchmark
Total violations 465 421.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 7 8.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 67.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 4,739 2,774 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,185 regulated public water systems in Mississippi.

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 Oak Hill Water Assn water safe to drink?
Oak Hill Water Assn (PWS ID: MS0580004) has 465 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 4,739 people using Groundwater sources.
How many people does Oak Hill Water Assn serve?
Oak Hill Water Assn serves 4,739 people in Pontotoc, Mississippi. It is a Public/Private-owned system using Groundwater water sources with 1,795 service connections.
What type of violations does Oak Hill Water Assn have?
Oak Hill Water Assn has 465 total violations: 7 health-based violations (MCL exceedances or treatment failures), 451 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Oak Hill Water Assn water?
No. Oak Hill Water Assn was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Oak Hill Water Assn use?
Oak Hill Water Assn 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.
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.