Twin Knolls Fourth/fifth Addition
EPA ID: IA5784326 · 90 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Twin Knolls Fourth/fifth Addition (IA5784326): 1 violation recorded with unresolved status in the SDWIS data used. Looking at the EPA enforcement file for Twin Knolls Fourth/fifth Addition, 1 violation is listed as unresolved as of its reporting date; the utility's service area includes approximately 90 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Twin Knolls Fourth/fifth Addition Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Twin Knolls Fourth/fifth Addition have a median household income of $164,972 and about 8,357 residents live in those ZIP codes (Census; not the number of people this system supplies).
💧 Where Does Your Water Come From?
Twin Knolls Fourth/fifth Addition's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Iowa
System Overview
Twin Knolls Fourth/fifth Addition (EPA ID: IA5784326) is a community water system in Iowa that serves approximately 90 people from groundwater sources.
This system serves ZIP code 52411 in Cedar Rapids.
Violation History
Status breakdown for accepted records with record years 2021-2026: 9 resolved, 0 archived, 0 addressed, and 1 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| May 24, 2025 | Public Notice | Non-health-based | Unaddressed (current) |
| January 1, 2025 | Revised Total Coliform Rule | Non-health-based | Resolved |
| December 1, 2024 | Lead and Copper Rule | Non-health-based | Resolved |
| May 13, 2023 | Public Notice | Non-health-based | Resolved |
| October 12, 2022 | Public Notice | Non-health-based | Resolved |
| August 1, 2022 | Total Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| August 1, 2022 | TTHM | Non-health-based | Resolved |
| July 13, 2022 | Public Notice | Non-health-based | Resolved |
| July 1, 2022 | Consumer Confidence Rule | Non-health-based | Resolved |
| December 1, 2021 | Lead and Copper Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Public Notice | Other (notice or report rule) | 4 | No |
| Public Notice | Monitoring & Reporting | 2 | No |
| Total Haloacetic Acids (HAA5) | Monitoring & Reporting | 1 | No |
| TTHM | Monitoring & Reporting | 1 | No |
| Consumer Confidence Rule | Other (notice or report rule) | 1 | No |
| Revised Total Coliform Rule | Monitoring & Reporting | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.001 mg/L | No | 2024-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by IA or modeled from parcel and building-footprint data.
- 52411 - Cedar Rapids
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Twin Knolls Fourth/fifth Addition (IA5784326) on EPA.gov.
Frequently Asked Questions
Is Twin Knolls Fourth/fifth Addition water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 1 current noncompliance record and zero current records classified as health-based. That classification is not a property-specific water test or safety guarantee.
How many people does Twin Knolls Fourth/fifth Addition serve?
Twin Knolls Fourth/fifth Addition serves approximately 90 people across 1 ZIP code in Iowa.
Where does Twin Knolls Fourth/fifth Addition get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Twin Knolls Fourth/fifth Addition (IA): 10 EPA Violations. https://zipcheckup.com/water-system/ia5784326/
@misc{zipcheckup-water-system-ia5784326,
author = {{ZipCheckup}},
title = {{Twin Knolls Fourth/fifth Addition (IA): 10 EPA Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ia5784326/}
}
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Twin Knolls Fourth/fifth Addition (EPA ID: IA5784326) - request the latest Consumer Confidence Report or ask about specific contaminants.