City water profile

Water hardness in Trenton

Find official utility reports, understand hardness, and check the water system serving your home in Trenton, New Jersey.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: 4 PPM below
Evidence comparison rank: #3 of 3
Matched utilities: 1
Active health records: 1

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.

Trenton Water Works

NJ1111001 · Surface water · 217,000 people served system-wide

A municipal system, in-state city, and served county all agree with this Census ZCTA.

1 reported active health-based record(s) for this system

Find this utility’s official report →

Measurements (2)

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: 0.006 mg/L
Action level: 0.015 mg/L

40% of the listed benchmark

Monitoring period: Jan 1, 2026 to Jun 30, 2026

TTHM

EPA SDWIS reported health-based violation

Reported violation

Reported level: 0.081 MG/L
Maximum contaminant level: 0.08 MG/L

101% of the listed benchmark

Monitoring period: Oct 1, 2024 to Dec 31, 2024

Violation history (93)

Imported violation history for Trenton Water Works
Rule	Status	Period
TTHMHealth-based	Archived	Oct 1, 2024 to Dec 31, 2024
Lead and Copper Rule	Resolved	Jul 1, 2024 to Dec 31, 2024
Total Haloacetic Acids (HAA5)	Resolved	Dec 28, 2023 to Dec 20, 2024
Revised Total Coliform Rule	Resolved	Nov 1, 2023 to Nov 30, 2023
Surface Water Treatment Rule	Resolved	Nov 1, 2023 to Nov 30, 2023
TTHM	Archived	Oct 1, 2023 to Dec 31, 2023
Revised Total Coliform Rule	Resolved	Oct 1, 2023 to Oct 31, 2023
Surface Water Treatment Rule	Resolved	Oct 1, 2023 to Oct 31, 2023
Total Haloacetic Acids (HAA5)	Archived	Oct 1, 2023 to Dec 31, 2023
Chlorine	Resolved	Oct 1, 2023 to Dec 31, 2023
Chlorine	Archived	Oct 1, 2023 to Dec 31, 2023
Lead and Copper Rule	Resolved	Sep 29, 2023 to Jan 24, 2024
Revised Total Coliform Rule	Resolved	Sep 1, 2023 to Sep 30, 2023
Surface Water Treatment Rule	Resolved	Sep 1, 2023 to Sep 30, 2023
Revised Total Coliform Rule	Resolved	Aug 1, 2023 to Aug 31, 2023
Surface Water Treatment Rule	Resolved	Aug 1, 2023 to Aug 31, 2023
Revised Total Coliform Rule	Resolved	Jul 1, 2023 to Jul 31, 2023
TTHM	Archived	Jul 1, 2023 to Sep 30, 2023
Total Haloacetic Acids (HAA5)	Archived	Jul 1, 2023 to Sep 30, 2023
Lead and Copper Rule	Resolved	Jul 1, 2023 to Dec 31, 2023
Chlorine	Resolved	Jul 1, 2023 to Sep 30, 2023
Chlorine	Archived	Jul 1, 2023 to Sep 30, 2023
Surface Water Treatment Rule	Resolved	Jul 1, 2023 to Jul 31, 2023
Lead and Copper Rule	Resolved	Jul 1, 2023 to Dec 31, 2023
Chlorine	Archived	Jul 1, 2023 to Sep 30, 2023
Revised Total Coliform Rule	Resolved	Jun 1, 2023 to Jun 30, 2023
Surface Water Treatment Rule	Resolved	Jun 1, 2023 to Jun 30, 2023
Surface Water Treatment Rule	Resolved	May 1, 2023 to May 31, 2023
Revised Total Coliform Rule	Resolved	May 1, 2023 to May 31, 2023
Revised Total Coliform Rule	Resolved	Apr 1, 2023 to Apr 30, 2023
Total Haloacetic Acids (HAA5)	Archived	Apr 1, 2023 to Jun 30, 2023
Chlorine	Resolved	Apr 1, 2023 to Jun 30, 2023
Chlorine	Archived	Apr 1, 2023 to Jun 30, 2023
Chlorine	Archived	Apr 1, 2023 to Jun 30, 2023
Surface Water Treatment Rule	Resolved	Apr 1, 2023 to Apr 30, 2023
TTHM	Archived	Apr 1, 2023 to Jun 30, 2023
Revised Total Coliform Rule	Resolved	Mar 1, 2023 to Mar 31, 2023
Surface Water Treatment Rule	Resolved	Mar 1, 2023 to Mar 31, 2023
Interim Enhanced Surface Water Treatment Rule	Resolved	Mar 1, 2023 to Mar 31, 2023
Revised Total Coliform Rule	Resolved	Feb 1, 2023 to Feb 28, 2023
Surface Water Treatment Rule	Resolved	Feb 1, 2023 to Feb 28, 2023
Nitrate	Resolved	Jan 1, 2023 to Dec 31, 2023
Xylenes, Total	Resolved	Jan 1, 2023 to Dec 31, 2023
DICHLOROMETHANE	Resolved	Jan 1, 2023 to Dec 31, 2023
o-Dichlorobenzene	Resolved	Jan 1, 2023 to Dec 31, 2023
p-Dichlorobenzene	Resolved	Jan 1, 2023 to Dec 31, 2023
Vinyl chloride	Resolved	Jan 1, 2023 to Dec 31, 2023
1,2-Dichloroethane	Resolved	Jan 1, 2023 to Dec 31, 2023
1,1,1-Trichloroethane	Resolved	Jan 1, 2023 to Dec 31, 2023
1,1,2-Trichloroethane	Resolved	Jan 1, 2023 to Dec 31, 2023
Tetrachloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2023
CHLOROBENZENE	Resolved	Jan 1, 2023 to Dec 31, 2023
Benzene	Resolved	Jan 1, 2023 to Dec 31, 2023
Toluene	Resolved	Jan 1, 2023 to Dec 31, 2023
TTHM	Archived	Jan 1, 2023 to Mar 31, 2023
Revised Total Coliform Rule	Resolved	Jan 1, 2023 to Jan 31, 2023
Chlorine	Resolved	Jan 1, 2023 to Mar 31, 2023
Chlorine	Archived	Jan 1, 2023 to Mar 31, 2023
Surface Water Treatment Rule	Resolved	Jan 1, 2023 to Jan 31, 2023
Ethylbenzene	Resolved	Jan 1, 2023 to Dec 31, 2023
Styrene	Resolved	Jan 1, 2023 to Dec 31, 2023
Lead and Copper Rule	Resolved	Jan 1, 2023 to Jun 29, 2023
Lead and Copper Rule	Resolved	Jan 1, 2023 to Jun 30, 2023
Trichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2023
Total Haloacetic Acids (HAA5)	Archived	Jan 1, 2023 to Mar 31, 2023
Chlorine	Archived	Jan 1, 2023 to Mar 31, 2023
trans-1,2-Dichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2023
1,1-Dichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2023
Carbon tetrachloride	Resolved	Jan 1, 2023 to Dec 31, 2023
1,2,4-Trichlorobenzene	Resolved	Jan 1, 2023 to Dec 31, 2023
1,2-Dichloropropane	Resolved	Jan 1, 2023 to Dec 31, 2023
cis-1,2-Dichloroethylene	Resolved	Jan 1, 2023 to Dec 31, 2023
Revised Total Coliform Rule	Resolved	Dec 1, 2022 to Dec 31, 2022
Surface Water Treatment Rule	Resolved	Dec 1, 2022 to Dec 31, 2022
Surface Water Treatment Rule	Resolved	Nov 1, 2022 to Nov 30, 2022
Revised Total Coliform Rule	Resolved	Nov 1, 2022 to Nov 30, 2022
TTHM	Archived	Oct 1, 2022 to Dec 31, 2022
Chlorine	Archived	Oct 1, 2022 to Dec 31, 2022
Chlorine	Resolved	Oct 1, 2022 to Dec 31, 2022
Total Haloacetic Acids (HAA5)	Archived	Oct 1, 2022 to Dec 31, 2022
Lead and Copper Rule	Resolved	Jan 1, 2022 to Dec 21, 2021
Public Notice	Resolved	Aug 18, 2021 to Dec 1, 2021
Consumer Confidence Rule	Resolved	Jul 1, 2021 to Aug 20, 2021
Interim Enhanced Surface Water Treatment Rule	Resolved	Jul 1, 2021 to Jul 31, 2021
Interim Enhanced Surface Water Treatment RuleHealth-based	Resolved	Jul 1, 2021 to Jul 31, 2021
Lead and Copper Rule	Resolved	Jul 1, 2021 to Dec 31, 2021
TTHMHealth-based	Archived	Jul 1, 2021 to Sep 30, 2021
Interim Enhanced Surface Water Treatment Rule	Resolved	Apr 1, 2021 to Apr 29, 2021
Lead and Copper RuleHealth-based	Resolved	Jan 1, 2021 to Jun 30, 2021
Lead and Copper Rule	Resolved	Jan 1, 2021 to Jun 30, 2021
Fluoride	Resolved	Jan 1, 2021 to Dec 22, 2021
Lead and Copper RuleHealth-based	Addressed	May 21, 2020
Public Notice	Addressed	Mar 3, 2018

City summary

What the indexed records say

Trenton has 7 published ZIP profiles across Mercer County. The regional-evidence median is 75 PPM. Its comparison-eligible median is 75 PPM versus 79 PPM statewide.

Among the 3 New Jerseycities meeting the comparison standard, Trenton ranks #3from highest to lowest. Across all 84 state ZIP profiles, available estimates run from 12.6to 296.5 PPM.

The 69.9–80.9 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard7 ZIPs

Hard0 ZIPs

Very hard0 ZIPs

7 of 7 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 2 miles
Profiles with evidence: 7/7

Confidence labels

High: 7Moderate: 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 New Jersey communities

Stone Harbor

Cape May County

73 PPM median

Bordentown

Burlington County

77 PPM median

Camden

Camden County

78 PPM median

Avalon

Cape May County

72 PPM median

Helmetta

Middlesex County

72 PPM median

National Park

Gloucester County

81 PPM median

Search all 60 New Jersey cities →

Questions people ask

About water in Trenton

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.