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City water profile

Hartford water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Hartford, Wisconsin.

Median indexed hardness

397PPM

2 indexed ZIPs

Range 395–398 PPM

State comparison
109 PPM above
State hardness rank
#48 of 479
Matched utilities
2
Active health records
0

City summary

What the indexed records say

Hartford has 2 published ZIP profiles across Washington County and Dodge County. The indexed median is 397 PPM, compared with 288 PPM across Wisconsin.

Among the 479 Wisconsincities with an indexed median, Hartford ranks #48from highest to lowest. Across all 556 state ZIP profiles, available estimates run from 41.3to 467 PPM.

The 395–398 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard2 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
13.7 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 2Low: 0

Observation window: Jun 1, 2017 to Aug 20, 2024.

ZIP directory

Water reports in Hartford

Open a ZIP for site-level provenance and measurements.

ZIP code

53027

Very Hard

398 PPM

Nearest site
9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

53078

Very Hard

395 PPM

Nearest site
13.7 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Hartford Waterworks

PWSID WI2670110

Groundwater
System population served
15,805
Last reported
May 29, 2026

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

Lakeside Estates

PWSID WI2670109

Groundwater
System population served
54
Last reported
May 29, 2026

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

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

No violation records are included in the current lookback window.

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Hartford

Is the water hard?

The indexed city median is 397 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

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.