City water profile

Water hardness in Wilmington

Find official utility reports, understand hardness, and check the water system serving your home in Wilmington, Delaware.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: 56 PPM above
Evidence comparison rank: #1 of 2
Matched utilities: 2
Active health records: 0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →

Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Wilmington Water Department

DE0000663 · Surface water · 107,976 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2021 to Dec 31, 2023

Violation history (1)

Imported violation history for Wilmington Water Department
Rule	Status	Period
Revised Total Coliform Rule	Resolved	Aug 1, 2023 to Aug 31, 2023

Veolia Water Delaware, Inc

DE0000564 · Surface water · 100,495 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.002 mg/L
Action level: 0.015 mg/L

13% of the listed benchmark

Monitoring period: Jan 1, 2021 to Dec 31, 2023

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

City summary

What the indexed records say

Wilmington has 6 published ZIP profiles across New Castle County. The regional-evidence median is 119 PPM. Its comparison-eligible median is 119 PPM versus 63 PPM statewide.

Among the 2 Delawarecities meeting the comparison standard, Wilmington ranks #1from highest to lowest. Across all 48 state ZIP profiles, available estimates run from 31.1to 129 PPM.

The 115–129 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard4 ZIPs

Hard2 ZIPs

Very hard0 ZIPs

6 of 6 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 5.9 miles
Profiles with evidence: 6/6

Confidence labels

High: 6Moderate: 0Low: 0

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Delaware communities

Bear

New Castle County

99 PPM median

Hockessin

New Castle County

117 PPM median

Middletown

New Castle County

77 PPM median

New Castle

New Castle County

111 PPM median

Newark

New Castle County

119 PPM median

Odessa

New Castle County

66 PPM median

Search all 37 Delaware cities →

Questions people ask

About water in Wilmington

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.