Water Quality in Stamford, CT: 760 Violations — Grade C
Grade C · Score 64/100 · 5 water systems · Updated 2026-05-03
Stamford'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
Stamford, CT has 760 violations in the EPA compliance history — breakdown below.
Water Quality Map: Stamford, CT
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Water Quality by ZIP Code in Stamford
Water quality varies across Stamford's 19 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 06902 | D | 54 | 40 | 1 | View report → |
| 06903 | C | 59 | 40 | 1 | View report → |
| 06905 | C | 59 | 40 | 1 | View report → |
| 06906 | C | 64 | 40 | 1 | View report → |
| 06907 | C | 64 | 40 | 1 | View report → |
| 06910 | C | 65 | 40 | 1 | View report → |
| 06911 | C | 65 | 40 | 1 | View report → |
| 06912 | C | 65 | 40 | 1 | View report → |
| 06913 | C | 65 | 40 | 1 | View report → |
| 06914 | C | 65 | 40 | 1 | View report → |
| 06920 | C | 65 | 40 | 1 | View report → |
| 06921 | C | 65 | 40 | 1 | View report → |
| 06922 | C | 65 | 40 | 1 | View report → |
| 06925 | C | 65 | 40 | 1 | View report → |
| 06926 | C | 65 | 40 | 1 | View report → |
Violation Trend
EPA violations recorded for water systems serving Stamford.
Water Quality Overview
Stamford, Connecticut receives a water quality grade of C with an overall score of 64 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 5 water systems serving Stamford have accumulated 760 EPA violations, including 19 health-based violations. These violations are tracked across 19 ZIP codes serving approximately 592 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Stamford'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
The average 90th percentile lead level across Stamford water systems is 0.0020 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 73% of homes built before 1986, Stamford 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
Stamford 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 Stamford
Stamford is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 592 people across 19 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 190 enforcement actions against water systems serving Stamford. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Stamford
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 Stamford Water Systems
The following contaminants have been detected or caused violations across Stamford's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Lead and Copper Rule | Treatment Technique | N/A | 95 | 19 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 95 | 19 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 76 | 19 | No |
| Nickel | Inorganic | 0.1 mg/L | 76 | 19 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 38 | 19 | No |
| Revised Total Coliform Rule | Microbiological | N/A | 19 | 19 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 19 | 19 | No |
| Total Coliform | Microbiological | N/A | 19 | 19 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Stamford:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2024 | 38 | 38 |
| 2025 | 19 | 19 |
Violations have decreased from 38 in 2024 to 19 in 2025, indicating improving compliance.
EPA Enforcement History
The EPA and state regulators have taken 9 enforcement actions against water systems serving Stamford. Recent actions:
| Date | Action Type |
|---|---|
| 2025-07-10 | State Order Extension |
| 2025-05-21 | State Order Extension |
| 2025-05-21 | State Informal Action |
| 2025-04-10 | State Informal Action |
| 2025-03-10 | State Informal Action |
| 2025-03-10 | State Informal Enforcement |
| 2024-12-31 | State Order Extension |
| 2024-09-17 | State Order Extension |
| 2024-08-28 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-07-10.
Stamford vs. Nearby Connecticut Cities
How Stamford's water quality compares to similar cities in Connecticut:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Stamford | C | 760 | 5 | 592 |
| Branford | C | 1 | 2 | 591 |
| Guilford | C | 1 | 2 | 591 |
| East Haddam | C | 11 | 5 | 603 |
Water Quality by ZIP Code in Stamford
Water quality varies across Stamford's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
| ZIP Code | Score | Grade | Violations | Health-Based |
|---|---|---|---|---|
| 06902 | 54 | D | 40 | 1 |
| 06903 | 59 | C | 40 | 1 |
| 06905 | 59 | C | 40 | 1 |
| 06906 | 64 | C | 40 | 1 |
| 06907 | 64 | C | 40 | 1 |
| 06910 | 65 | C | 40 | 1 |
| 06911 | 65 | C | 40 | 1 |
| 06912 | 65 | C | 40 | 1 |
| 06913 | 65 | C | 40 | 1 |
| 06914 | 65 | C | 40 | 1 |
| 06904 | 69 | C | 40 | 1 |
| 06901 | 69 | C | 40 | 1 |
| 06928 | 65 | C | 40 | 1 |
| 06927 | 65 | C | 40 | 1 |
| 06926 | 65 | C | 40 | 1 |
Common Questions About Stamford Water
These are the most common questions residents search for about water quality in Stamford, Connecticut:
Is Stamford water hard or soft? Water hardness varies by source. Stamford's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Stamford tap water? Stamford's water receives a grade of C (64/100). There are 19 health-based violations — consider filtration.
What is the best water filter for Stamford? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Stamford vs. Connecticut Average
Understanding how Stamford 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 Stamford.
ZIP Codes in Stamford
Stamford spans 19 ZIP codes. The ZIP with the lowest water quality score is 06901. 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.