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States → EPA Region 5 — Tribal Water Systems

Community Water System · PWS 055295704

Ridgeland

Oneida, EPA Region 5 — Tribal Water Systems 54155 - drinking water served from groundwater sources to 691 people, tracked in EPA SDWIS and UCMR5.

691
People served
94
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 94 drinking-water violations at Ridgeland.

94
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
691
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ridgeland

Ridgeland is a native american-owned community water system that delivers drinking water to 691 residents in Oneida, EPA Region 5 — Tribal Water Systems through 35 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 94 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 93 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 8 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 5 — 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
691
Total Violations
94
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
35
School/Daycare
No
MCL Violations
0
Monitoring Violations
93
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 8 1995
DICHLOROMETHANE MR 4 1996
1,2-Dichloropropane MR 4 1996
Tetrachloroethylene MR 4 1996
Toluene MR 4 1996
1,2,4-Trichlorobenzene MR 4 1996
1,1,1-Trichloroethane MR 4 1996
Benzene MR 4 1996
CHLOROBENZENE MR 4 1996
p-Dichlorobenzene MR 4 1996
o-Dichlorobenzene MR 4 1996
cis-1,2-Dichloroethylene MR 4 1996
trans-1,2-Dichloroethylene MR 4 1996
Ethylbenzene MR 4 1996
1,1-Dichloroethylene MR 4 1996
Vinyl chloride MR 4 1996
Xylenes, Total MR 4 1996
Styrene MR 4 1996
Carbon tetrachloride MR 4 1996
1,1,2-Trichloroethane MR 4 1996
Trichloroethylene MR 4 1996
1,2-Dichloroethane MR 4 1996
Revised Total Coliform Rule MON 1 2016

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 Ridgeland.

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 055295704 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 5 — Tribal Water Systems Drinking Water Authority

EPA Region 5 — 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 05 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
2016 Revised Total Coliform Rule MON 1 SDWIS / 055295704 / 8000
1996 DICHLOROMETHANE MR 4 SDWIS / 055295704 / 2964
1996 1,2-Dichloropropane MR 4 SDWIS / 055295704 / 2983
1996 Tetrachloroethylene MR 4 SDWIS / 055295704 / 2987
1996 Toluene MR 4 SDWIS / 055295704 / 2991
1996 1,2,4-Trichlorobenzene MR 4 SDWIS / 055295704 / 2378
1996 1,1,1-Trichloroethane MR 4 SDWIS / 055295704 / 2981
1996 Benzene MR 4 SDWIS / 055295704 / 2990
1996 CHLOROBENZENE MR 4 SDWIS / 055295704 / 2989
1996 p-Dichlorobenzene MR 4 SDWIS / 055295704 / 2969
1996 o-Dichlorobenzene MR 4 SDWIS / 055295704 / 2968
1996 cis-1,2-Dichloroethylene MR 4 SDWIS / 055295704 / 2380
1996 trans-1,2-Dichloroethylene MR 4 SDWIS / 055295704 / 2979
1996 Ethylbenzene MR 4 SDWIS / 055295704 / 2992
1996 1,1-Dichloroethylene MR 4 SDWIS / 055295704 / 2977

How Ridgeland Compares

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

Metric Ridgeland EPA Region 5 — Tribal Water Systems avg Federal benchmark
Total violations 94 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 691 - 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 5 — 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 Ridgeland water safe to drink? ▼
Ridgeland (PWS ID: 055295704) has 94 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 691 people using Groundwater sources.
How many people does Ridgeland serve? ▼
Ridgeland serves 691 people in Oneida, EPA Region 5 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 35 service connections.
What type of violations does Ridgeland have? ▼
Ridgeland has 94 total violations: 0 health-based violations (MCL exceedances or treatment failures), 93 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Ridgeland water? ▼
No PFAS testing data is available for Ridgeland under the EPA's UCMR5 monitoring program.
What water source does Ridgeland use? ▼
Ridgeland 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.