Water Quality in Nassau, DE: No Violations — Grade A
Grade A · Score 88/100 · 1 water system · Updated 2026-05-03
Nassau's water meets all EPA standards with no health-based violations.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Within the water supply network of Nassau, DE, no EPA violations appear anywhere in the federal compliance record — 1 public water system are tracked here, and not one has been cited for an MCL exceedance, a monitoring failure, or any other reportable compliance event.
Water Quality by ZIP Code in Nassau
Water quality varies across Nassau's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 19969 | A | 88 | 0 | 0 | View report → |
Water Quality Overview
Nassau, Delaware receives a water quality grade of A with an overall score of 88 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 1 water system serving Nassau. 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 A Means
A grade of A indicates excellent compliance with EPA drinking water standards. Nassau's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.
Lead Levels
Lead testing data for Nassau is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
Water Systems Serving Nassau
Nassau is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 66 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
How to Check Your Water in Nassau
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
Nassau vs. Nearby Delaware Cities
How Nassau's water quality compares to similar cities in Delaware:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Nassau | A | 0 | 1 | 66 |
| Hockessin | B | 2 | 1 | 60 |
| Montchanin | B | 2 | 1 | 60 |
| Rockland | C | 0 | 1 | 60 |
Common Questions About Nassau Water
These are the most common questions residents search for about water quality in Nassau, Delaware:
Is Nassau water hard or soft? Water hardness varies by source. Nassau's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Nassau tap water? Nassau's water receives a grade of A (88/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Nassau? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Nassau vs. Delaware Average
Understanding how Nassau compares to the broader Delaware 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 Nassau.
ZIP Codes in Nassau
Nassau 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.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade A is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.