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City water profile

Oxnard water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Oxnard, California.

Median indexed hardness

403PPM

5 indexed ZIPs

Range 336–444.5 PPM

State comparison
214 PPM above
State hardness rank
#18 of 242
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Oxnard has 5 published ZIP profiles across Ventura County. The indexed median is 403 PPM, compared with 189 PPM across California.

Among the 242 Californiacities with an indexed median, Oxnard ranks #18from highest to lowest. Across all 678 state ZIP profiles, available estimates run from 3.3to 728.5 PPM.

The 336–444.5 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard5 ZIPs

5 of 5 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
45.8 miles
Profiles with evidence
5/5

Confidence labels

High: 0Moderate: 0Low: 5

Observation window: Apr 5, 2016 to Apr 14, 2022.

ZIP directory

Water reports in Oxnard

Open a ZIP for site-level provenance and measurements.

ZIP code

93030

Very Hard

336 PPM

Nearest site
45.8 mi
Confidence
Low

View full ZIP evidence →

ZIP code

93033

Very Hard

403 PPM

Nearest site
49.3 mi
Confidence
Low

View full ZIP evidence →

ZIP code

93035

Very Hard

444.5 PPM

Nearest site
43.9 mi
Confidence
Low

View full ZIP evidence →

ZIP code

93036

Very Hard

336 PPM

Nearest site
45.4 mi
Confidence
Low

View full ZIP evidence →

ZIP code

93042

Very Hard

438 PPM

Nearest site
65 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Oxnard Water Dept

PWSID CA5610007

Surface water
System population served
200,232
Last reported
Jun 22, 2026

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

Is the water hard?

The indexed city median is 403 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.