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Transient Non-Community Water System · PWS IA2817710

Rocky Nook Association, Inc.

Delhi, Iowa 52223 - drinking water served from groundwater sources to 50 people, tracked in EPA SDWIS and UCMR5.

50
People served
250
EPA violations
52
Health-based
Untested
UCMR5 result

The verdict

EPA records 250 drinking-water violations at Rocky Nook Association, Inc., 21% of them health-based - above the Iowa per-system average.

250
Total EPA violations on record
21%
Health-based (MCL / treatment failure)
50
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Rocky Nook Association, Inc.

Rocky Nook Association, Inc. is a private-owned transient non-community water system that delivers drinking water to 50 residents in Delhi, Iowa (Delaware County) through 46 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 250 total violations for this system , of which 52 (21%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 124 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 61 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 Iowa, EPA tracks 1,795 public water systems serving 3,114,444 people, with 138,271 cumulative violations and 27,946 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 77 violations. Statewide, 32 of 152 UCMR5-tested systems have reported PFAS detections (21.1%).

Rocky Nook Association, Inc.'s 250 violations sit above the Iowa 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
50
Total Violations
250
Health-Based Violations
52
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
46
County
Delaware
School/Daycare
No
MCL Violations
48
Monitoring Violations
124
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 61 2015
Nitrate MR 60 2015
Coliform (TCR) MCL 40 2007
Public Notice Other 29 2016
Nitrate MCL 8 1998
Revised Total Coliform Rule TT 4 2018
Nitrite MR 3 1995

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 Rocky Nook Association, Inc..

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 IA2817710 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Iowa Drinking Water Authority

Iowa'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 IA 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
2018 Revised Total Coliform Rule TT 4 SDWIS / IA2817710 / 8000
2016 Public Notice Other 29 SDWIS / IA2817710 / 7500
2015 Coliform (TCR) MR 61 SDWIS / IA2817710 / 3100
2015 Nitrate MR 60 SDWIS / IA2817710 / 1040
2007 Coliform (TCR) MCL 40 SDWIS / IA2817710 / 3100
1998 Nitrate MCL 8 SDWIS / IA2817710 / 1040
1995 Nitrite MR 3 SDWIS / IA2817710 / 1041

How Rocky Nook Association, Inc. Compares

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

Metric Rocky Nook Association, Inc. Iowa avg Federal benchmark
Total violations 250 77 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 52 15.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 21.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 50 1,735 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,795 regulated public water systems in Iowa.

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 Rocky Nook Association, Inc. water safe to drink? ▼
Rocky Nook Association, Inc. (PWS ID: IA2817710) has 250 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 50 people using Groundwater sources.
How many people does Rocky Nook Association, Inc. serve? ▼
Rocky Nook Association, Inc. serves 50 people in Delhi, Iowa. It is a Private-owned system using Groundwater water sources with 46 service connections.
What type of violations does Rocky Nook Association, Inc. have? ▼
Rocky Nook Association, Inc. has 250 total violations: 52 health-based violations (MCL exceedances or treatment failures), 124 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Rocky Nook Association, Inc. water? ▼
No PFAS testing data is available for Rocky Nook Association, Inc. under the EPA's UCMR5 monitoring program.
What water source does Rocky Nook Association, Inc. use? ▼
Rocky Nook Association, Inc. uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.