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Community Water System · PWS TN0000126

Collierville Water Dept

Collierville, Tennessee 38017 - drinking water served from groundwater sources to 51,972 people, tracked in EPA SDWIS and UCMR5.

51,972
People served
55
EPA violations
5
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 55 drinking-water violations at Collierville Water Dept, 9% of them health-based - below the Tennessee per-system average.

55
Total EPA violations on record
9%
Health-based (MCL / treatment failure)
51,972
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Collierville Water Dept

Collierville Water Dept is a local-owned community water system that delivers drinking water to 51,972 residents in Collierville, Tennessee (Shelby County) through 20,144 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 55 total violations for this system , of which 5 (9%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 41 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 18 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 Tennessee, EPA tracks 762 public water systems serving 7,934,203 people, with 43,318 cumulative violations and 9,414 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 56.8 violations. Statewide, 93 of 277 UCMR5-tested systems have reported PFAS detections (33.6%).

Collierville Water Dept's 55 violations sit below the Tennessee 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
51,972
Total Violations
55
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
20,144
County
Shelby
School/Daycare
No
MCL Violations
5
Monitoring Violations
41
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 18 2000
Consumer Confidence Rule Other 7 2021
Coliform (TCR) MCL 5 1998
Lead and Copper Rule MR 3 2020
Benzene MR 1 1988
Carbon tetrachloride MR 1 1988
p-Dichlorobenzene MR 1 1988
1,1,1-Trichloroethane MR 1 1988
Trichloroethylene MR 1 1988
Vinyl chloride MR 1 1988
o-Dichlorobenzene MR 1 1988
cis-1,2-Dichloroethylene MR 1 1988
trans-1,2-Dichloroethylene MR 1 1988
DICHLOROMETHANE MR 1 1988
1,2-Dichloropropane MR 1 1988
Ethylbenzene MR 1 1988
1,2,4-Trichlorobenzene MR 1 1988
1,1,2-Trichloroethane MR 1 1988
Public Notice Other 1 2021
Tetrachloroethylene MR 1 1988
Styrene MR 1 1988
CHLOROBENZENE MR 1 1988
Toluene MR 1 1988
1,1-Dichloroethylene MR 1 1988
1,2-Dichloroethane MR 1 1988

PFAS Testing Results (UCMR5)

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

Contaminant Date Result MRL Status
6:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/20/2023 <6.00 ppt 6.00 ppt Not Detected
PFEESA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/20/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 9/20/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
NFDHA 9/20/2023 <20.00 ppt 20.00 ppt Not Detected
PFBA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFMBA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 9/20/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/20/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 9/20/2023 <8.00 ppt 8.00 ppt Not Detected
PFEESA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 9/20/2023 <7.00 ppt 7.00 ppt Not Detected
ADONA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
PFNA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
PFOS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
HFPO-DA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/20/2023 <5.00 ppt 5.00 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 Collierville Water Dept.

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 TN0000126 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Tennessee Drinking Water Authority

Tennessee Department of Environment & Conservation, Drinking Water is the primacy agency that licenses and inspects Collierville Water Dept under EPA-delegated authority.

Open TN regulator portal

Source: Tennessee Department of Environment & Conservation, Drinking Water

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
2021 Consumer Confidence Rule Other 7 SDWIS / TN0000126 / 7000
2021 Public Notice Other 1 SDWIS / TN0000126 / 7500
2020 Lead and Copper Rule MR 3 SDWIS / TN0000126 / 5000
2000 Coliform (TCR) MR 18 SDWIS / TN0000126 / 3100
1998 Coliform (TCR) MCL 5 SDWIS / TN0000126 / 3100
1988 Benzene MR 1 SDWIS / TN0000126 / 2990
1988 Carbon tetrachloride MR 1 SDWIS / TN0000126 / 2982
1988 p-Dichlorobenzene MR 1 SDWIS / TN0000126 / 2969
1988 1,1,1-Trichloroethane MR 1 SDWIS / TN0000126 / 2981
1988 Trichloroethylene MR 1 SDWIS / TN0000126 / 2984
1988 Vinyl chloride MR 1 SDWIS / TN0000126 / 2976
1988 o-Dichlorobenzene MR 1 SDWIS / TN0000126 / 2968
1988 cis-1,2-Dichloroethylene MR 1 SDWIS / TN0000126 / 2380
1988 trans-1,2-Dichloroethylene MR 1 SDWIS / TN0000126 / 2979
1988 DICHLOROMETHANE MR 1 SDWIS / TN0000126 / 2964

How Collierville Water Dept Compares

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

Metric Collierville Water Dept Tennessee avg Federal benchmark
Total violations 55 56.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 12.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 33.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 51,972 10,412 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 762 regulated public water systems in Tennessee.

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 Collierville Water Dept water safe to drink? ▼
Collierville Water Dept (PWS ID: TN0000126) has 55 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 51,972 people using Groundwater sources.
How many people does Collierville Water Dept serve? ▼
Collierville Water Dept serves 51,972 people in Collierville, Tennessee. It is a Local-owned system using Groundwater water sources with 20,144 service connections.
What type of violations does Collierville Water Dept have? ▼
Collierville Water Dept has 55 total violations: 5 health-based violations (MCL exceedances or treatment failures), 41 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Collierville Water Dept water? ▼
No. Collierville Water Dept was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Collierville Water Dept use? ▼
Collierville Water Dept 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.

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.