Twin Knolls Fourth/fifth Addition
EPA ID: IA5784326 · 90 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Twin Knolls Fourth/fifth Addition (IA5784326): 1 unresolved EPA violation on record. Not yet resolved: 1 EPA violation at Twin Knolls Fourth/fifth Addition, affecting about 90 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Twin Knolls Fourth/fifth Addition Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Twin Knolls Fourth/fifth Addition serves a community with a median household income of $164,972 and an estimated 8,357 residents across its service area.
💧 Where Does Your Water Come From?
Twin Knolls Fourth/fifth Addition's water is pumped from underground aquifers. 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
Detected Contaminants
How Twin Knolls Fourth/fifth Addition compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 1 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Total Trihalomethanes (TTHM) at 1 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Lead and Copper Rule at 4 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Haloacetic Acids (HAA5) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Iowa
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
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 | Lead and Copper Rule | Non-health-based | Unaddressed (current) |
| January 1, 2025 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| December 1, 2024 | Stage 1 DBP Rule | Non-health-based | Resolved |
| May 13, 2023 | Lead and Copper Rule | Non-health-based | Resolved |
| October 12, 2022 | Lead and Copper Rule | Non-health-based | Resolved |
| August 1, 2022 | Total Trihalomethanes (TTHM) | Non-health-based | Resolved |
| August 1, 2022 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| July 13, 2022 | Lead and Copper Rule | Non-health-based | Resolved |
| July 1, 2022 | Surface Water Treatment Rule | Non-health-based | Resolved |
| December 1, 2021 | Stage 1 DBP 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 |
|---|---|---|---|
| Lead and Copper Rule | Treatment Failure | 4 | No |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 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 | N/A |
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: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
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 the full compliance record 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.