Water Quality in Ansonia, CT: No Violations - Grade D
Grade D · Score 53/100 · 2 water systems · Updated 2026-07-18
Ansonia's water has significant violations. Water testing and filtration are recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
When EPA compliance data is reviewed for Ansonia, CT, the result holds consistent: zero violations documented across 2 tracked water systems, with every health-based limit and monitoring requirement met through the full dataset available in SDWIS.
Water Quality by ZIP Code in Ansonia
Ansonia is covered by a single ZIP code, so one water-quality profile applies citywide. See the contaminant data below.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 06401 | D | 53 | 0 | 0 | View report → |
Water Quality Overview
Ansonia, Connecticut receives a water quality grade of D with an overall score of 53 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 2 water systems serving Ansonia. This is a positive indicator, though it does not guarantee the absence of all contaminants - some substances (like PFAS) are not yet fully regulated.
What Grade D Means
A grade of D indicates significant compliance issues. Ansonia's water systems have accumulated violations that suggest ongoing water quality challenges. Residents should check their specific ZIP code report and consider water testing or filtration.
Lead Levels
Lead testing data for Ansonia is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 84% of homes built before 1986, Ansonia has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Radon Risk
Ansonia is in EPA Radon Zone 1 (High risk). The EPA recommends all homes in Zone 1 areas be tested for radon. Radon is the second leading cause of lung cancer after smoking.
Water Systems Serving Ansonia
Ansonia is served by 2 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 19,160 people across 1 ZIP code.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 2 enforcement actions against water systems serving Ansonia. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Ansonia
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
EPA Enforcement History
The EPA and state regulators have taken 2 enforcement actions against water systems serving Ansonia. Recent actions:
| Date | Action Type |
|---|---|
| 2021-05-26 | State Order Extension |
| 2021-03-15 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2021-05-26.
Ansonia vs. Nearby Connecticut Cities
How Ansonia's water quality compares to similar cities in Connecticut:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Ansonia | D | 0 | 2 | 19,160 |
| Avon | B | 6 | 4 | 19,157 |
| Willimantic | B | 3 | 3 | 19,068 |
| Monroe | C | 0 | 2 | 18,833 |
Common Questions About Ansonia Water
These are the most common questions residents search for about water quality in Ansonia, Connecticut:
Is Ansonia water hard or soft? Water hardness varies by source. Ansonia's 2 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Ansonia tap water? Ansonia's water receives a grade of D (53/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Ansonia? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Ansonia vs. Connecticut Average
Understanding how Ansonia compares to the broader Connecticut average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Ansonia.
ZIP Codes in Ansonia
Ansonia spans 1 ZIP code. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.