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INDIAN SUMMER CO-OP

PWS ID: MI2021953 · LUDINGTON, Michigan 49431

INDIAN SUMMER CO-OP serves 260 people in LUDINGTON, Michigan using Groundwater water sources. It has 131 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: INDIAN SUMMER CO-OP

INDIAN SUMMER CO-OP is a private-owned non-transient non-community water system that delivers drinking water to 260 residents in LUDINGTON, Michigan (Mason County) through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 131 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 127 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Revised Total Coliform Rule, recorded in 12 violations (MON). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Michigan, EPA tracks 10,959 public water systems serving 9,098,093 people, with 255,201 cumulative violations and 31,467 health-based violations on record. About 86% of systems in the state carry at least one violation, and state-wide the average per system is 23.3 violations. INDIAN SUMMER CO-OP's 131 violations sit above the Michigan average. Statewide, 87 of 318 UCMR5-tested systems have reported PFAS detections (27.4%). 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
260
Total Violations
131
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
2
County
Mason
School/Daycare
No
MCL Violations
0
Monitoring Violations
127
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 12 2019
Lead and Copper Rule MR 4 2019
Arsenic MR 2 2014
CYANIDE MR 2 2014
BHC-GAMMA MR 2 2011
Methoxychlor MR 2 2011
Toxaphene MR 2 2011
Simazine MR 2 2011
Dinoseb MR 2 2011
Aldicarb sulfoxide MR 2 2011
Carbofuran MR 2 2011
Aldicarb MR 2 2011
LASSO MR 2 2011
Heptachlor epoxide MR 2 2011
HEXACHLOROBENZENE MR 2 2011
Pentachlorophenol MR 2 2011
Chlordane MR 2 2011
cis-1,2-Dichloroethylene MR 2 2011
DICHLOROMETHANE MR 2 2011
o-Dichlorobenzene MR 2 2011
Vinyl chloride MR 2 2011
1,1-Dichloroethylene MR 2 2011
Carbon tetrachloride MR 2 2011
Trichloroethylene MR 2 2011
Tetrachloroethylene MR 2 2011
Benzene MR 2 2011
Toluene MR 2 2011
Ethylbenzene MR 2 2011
Barium MR 2 2014
Chromium MR 2 2014

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 INDIAN SUMMER CO-OP.

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 MI2021953 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Michigan Drinking Water Authority

Michigan EGLE — Drinking Water and Environmental Health Division is the primacy agency that licenses and inspects INDIAN SUMMER CO-OP under EPA-delegated authority.

Open MI regulator portal

Source: Michigan EGLE — Drinking Water and Environmental Health Division

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
2019 Revised Total Coliform Rule MON 12 SDWIS / MI2021953 / 8000
2019 Lead and Copper Rule MR 4 SDWIS / MI2021953 / 5000
2017 Nitrate MR 1 SDWIS / MI2021953 / 1040
2014 Arsenic MR 2 SDWIS / MI2021953 / 1005
2014 CYANIDE MR 2 SDWIS / MI2021953 / 1024
2014 Barium MR 2 SDWIS / MI2021953 / 1010
2014 Chromium MR 2 SDWIS / MI2021953 / 1020
2014 Mercury MR 2 SDWIS / MI2021953 / 1035
2014 Antimony, Total MR 2 SDWIS / MI2021953 / 1074
2014 Thallium, Total MR 2 SDWIS / MI2021953 / 1085
2014 Selenium MR 2 SDWIS / MI2021953 / 1045
2014 Nickel MR 2 SDWIS / MI2021953 / 1036
2014 Beryllium, Total MR 2 SDWIS / MI2021953 / 1075
2014 Cadmium MR 2 SDWIS / MI2021953 / 1015
2011 BHC-GAMMA MR 2 SDWIS / MI2021953 / 2010

How INDIAN SUMMER CO-OP Compares

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

Metric INDIAN SUMMER CO-OP Michigan avg Federal benchmark
Total violations 131 23.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 2.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 27.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 260 830 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,959 regulated public water systems in Michigan.

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 INDIAN SUMMER CO-OP water safe to drink? ▼
INDIAN SUMMER CO-OP (PWS ID: MI2021953) has 131 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 260 people using Groundwater sources.
How many people does INDIAN SUMMER CO-OP serve? ▼
INDIAN SUMMER CO-OP serves 260 people in LUDINGTON, Michigan. It is a Private-owned system using Groundwater water sources with 2 service connections.
What type of violations does INDIAN SUMMER CO-OP have? ▼
INDIAN SUMMER CO-OP has 131 total violations: 0 health-based violations (MCL exceedances or treatment failures), 127 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in INDIAN SUMMER CO-OP water? ▼
No PFAS testing data is available for INDIAN SUMMER CO-OP under the EPA's UCMR5 monitoring program.
What water source does INDIAN SUMMER CO-OP use? ▼
INDIAN SUMMER CO-OP uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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. This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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