Water Quality in Winchester, NH: 5 Violations — Grade C
Grade C · Score 69/100 · 3 water systems · Updated 2026-05-03
Winchester's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Looking at EPA compliance data for Winchester, NH, the record shows 5 violations — findings that span health-based exceedances, monitoring lapses, and enforcement events tied to local utilities in the SDWIS database.
Water Quality by ZIP Code in Winchester
Water quality varies across Winchester's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 03470 | C | 69 | 5 | 1 | View report → |
Water Quality Overview
Winchester, New Hampshire receives a water quality grade of C with an overall score of 69 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 3 water systems serving Winchester have accumulated 5 EPA violations, including 1 health-based violation. These violations are tracked across 1 ZIP codes serving approximately 3,067 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Winchester's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
Lead testing data for Winchester is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 65% of homes built before 1986, Winchester 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
Winchester is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Winchester
Winchester is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 3,067 people across 1 ZIP codes.
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 10 enforcement actions against water systems serving Winchester. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Winchester
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
Contaminants Detected in Winchester Water Systems
The following contaminants have been detected or caused violations across Winchester's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Stage 1 DBP Rule | Treatment Technique | N/A | 2 | 1 | No |
| Lead and Copper Rule | Treatment Technique | N/A | 1 | 1 | No |
| Total Organic Carbon | Disinfection Byproducts | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Winchester. Recent actions:
| Date | Action Type |
|---|---|
| 2025-07-01 | State Informal Action |
| 2025-05-21 | State Informal Action |
| 2025-05-21 | State Order Extension |
| 2025-05-20 | State Order Extension |
| 2025-04-23 | State Informal Action |
| 2025-04-23 | State Informal Enforcement |
| 2025-04-11 | State Filed Judgment |
| 2025-03-14 | State Informal Action |
| 2025-03-03 | State Order Extension |
| 2025-01-30 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-07-01.
Winchester vs. Nearby New Hampshire Cities
How Winchester's water quality compares to similar cities in New Hampshire:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Winchester | C | 5 | 3 | 3,067 |
| New London | B | 0 | 3 | 3,083 |
| Woodstock | B | 0 | 2 | 3,048 |
| Belmont | D | 1 | 5 | 3,021 |
Common Questions About Winchester Water
These are the most common questions residents search for about water quality in Winchester, New Hampshire:
Is Winchester water hard or soft? Water hardness varies by source. Winchester's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Winchester tap water? Winchester's water receives a grade of C (69/100). There are 1 health-based violations — consider filtration.
What is the best water filter for Winchester? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Winchester vs. New Hampshire Average
Understanding how Winchester compares to the broader New Hampshire 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 Winchester.
ZIP Codes in Winchester
Winchester spans 1 ZIP code. The ZIP with the lowest water quality score is 03470. 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.