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City water profile

Sea Ranch water quality

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

Median indexed hardness

142PPM

One indexed ZIP

Range 141.5–141.5 PPM

State comparison
47 PPM below
State hardness rank
#224 of 242
Matched utilities
1
Active health records
1

City summary

What the indexed records say

Sea Ranch has 1 published ZIP profile across Sonoma County. The indexed median is 142 PPM, compared with 189 PPM across California.

Among the 242 Californiacities with an indexed median, Sea Ranch ranks #224from highest to lowest. Across all 678 state ZIP profiles, available estimates run from 3.3to 728.5 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. 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
Hard1 ZIP
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
25.2 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: May 4, 2016 to May 4, 2023.

ZIP directory

Water reports in Sea Ranch

Open a ZIP for site-level provenance and measurements.

ZIP code

95497

Hard

141.5 PPM

Nearest site
25.2 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Sea Ranch Water Company,the (puc)

PWSID CA4910007

Surface water
System population served
1,160
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

1 unique active health-based record appears among associated systems. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
LEAD AND COPPER RULE REVISIONSCA4910007Oct 17, 2024Unaddressed
LEAD AND COPPER RULE REVISIONSCA4910007Oct 17, 2024Unaddressed · health-based
Lead and Copper RuleCA4910007Oct 1, 2024Resolved
Revised Total Coliform RuleCA4910007Sep 1, 2023Resolved

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 Sea Ranch

Is the water hard?

The indexed city median is 142 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.