PlainWater
States → Illinois

Community Water System · PWS IL0975245

Holly Hock Hill MHP

Flagstaff, Illinois 86002 - drinking water served from groundwater sources to 47 people, tracked in EPA SDWIS and UCMR5.

47
People served
221
EPA violations
8
Health-based
Untested
UCMR5 result

The verdict

EPA records 221 drinking-water violations at Holly Hock Hill MHP, 4% of them health-based - above the Illinois per-system average.

221
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
47
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Holly Hock Hill MHP

Holly Hock Hill MHP is a private-owned community water system that delivers drinking water to 47 residents in Flagstaff, Illinois (Lake County) through 29 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 221 total violations for this system , of which 8 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 158 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 37 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Illinois, EPA tracks 5,117 public water systems serving 12,576,876 people, with 355,322 cumulative violations and 52,932 health-based violations on record. About 81% of systems in the state carry at least one violation, and state-wide the average per system is 69.4 violations. Statewide, 123 of 487 UCMR5-tested systems have reported PFAS detections (25.3%).

Holly Hock Hill MHP's 221 violations sit above the Illinois 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
47
Total Violations
221
Health-Based Violations
8
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
29
County
Lake
School/Daycare
No
MCL Violations
8
Monitoring Violations
158
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 37 2010
Chlorine MR 28 2021
Public Notice Other 10 2022
Coliform (TCR) MCL 8 1998
BHC-GAMMA MR 3 1999
Toxaphene MR 3 1999
Atrazine MR 3 1999
Heptachlor MR 3 1999
2,4,5-TP MR 3 1999
2,4-D MR 3 1999
Pentachlorophenol MR 3 1999
Total Polychlorinated Biphenyls (PCB) MR 3 1999
1,2-DIBROMO-3-CHLOROPROPANE MR 3 1999
ETHYLENE DIBROMIDE MR 3 1999
Endrin MR 3 1999
Dalapon MR 3 1999
Diquat MR 3 1999
Endothall MR 3 1999
Di(2-ethylhexyl) adipate MR 3 1999
Di(2-ethylhexyl) phthalate MR 3 1999
Picloram MR 3 1999
Hexachlorocyclopentadiene MR 3 1999
Aldicarb MR 3 1999
HEXACHLOROBENZENE MR 3 1999
Benzo(a)pyrene MR 3 1999
Dinoseb MR 3 1999
Aldicarb sulfoxide MR 3 1999
OXAMYL MR 3 1999
Carbofuran MR 3 1999
Chlordane MR 3 1999

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 Holly Hock Hill MHP.

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 IL0975245 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Illinois Drinking Water Authority

Illinois EPA, Bureau of Water is the primacy agency that licenses and inspects Holly Hock Hill MHP under EPA-delegated authority.

Open IL regulator portal

Source: Illinois EPA, Bureau of 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
2022 Public Notice Other 10 SDWIS / IL0975245 / 7500
2021 Chlorine MR 28 SDWIS / IL0975245 / 0999
2010 Coliform (TCR) MR 37 SDWIS / IL0975245 / 3100
1999 BHC-GAMMA MR 3 SDWIS / IL0975245 / 2010
1999 Toxaphene MR 3 SDWIS / IL0975245 / 2020
1999 Atrazine MR 3 SDWIS / IL0975245 / 2050
1999 Heptachlor MR 3 SDWIS / IL0975245 / 2065
1999 2,4,5-TP MR 3 SDWIS / IL0975245 / 2110
1999 2,4-D MR 3 SDWIS / IL0975245 / 2105
1999 Pentachlorophenol MR 3 SDWIS / IL0975245 / 2326
1999 Total Polychlorinated Biphenyls (PCB) MR 3 SDWIS / IL0975245 / 2383
1999 1,2-DIBROMO-3-CHLOROPROPANE MR 3 SDWIS / IL0975245 / 2931
1999 ETHYLENE DIBROMIDE MR 3 SDWIS / IL0975245 / 2946
1999 Endrin MR 3 SDWIS / IL0975245 / 2005
1999 Dalapon MR 3 SDWIS / IL0975245 / 2031

How Holly Hock Hill MHP Compares

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

Metric Holly Hock Hill MHP Illinois avg Federal benchmark
Total violations 221 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 8 10.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 25.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 47 2,458 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,117 regulated public water systems in Illinois.

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 Holly Hock Hill MHP water safe to drink? ▼
Holly Hock Hill MHP (PWS ID: IL0975245) has 221 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 47 people using Groundwater sources.
How many people does Holly Hock Hill MHP serve? ▼
Holly Hock Hill MHP serves 47 people in Flagstaff, Illinois. It is a Private-owned system using Groundwater water sources with 29 service connections.
What type of violations does Holly Hock Hill MHP have? ▼
Holly Hock Hill MHP has 221 total violations: 8 health-based violations (MCL exceedances or treatment failures), 158 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Holly Hock Hill MHP water? ▼
No PFAS testing data is available for Holly Hock Hill MHP under the EPA's UCMR5 monitoring program.
What water source does Holly Hock Hill MHP use? ▼
Holly Hock Hill MHP 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.