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Water Hardness in 95565

Scotia, California · Humboldt County

143 PPM
8.3 GPG
Moderately Hard
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 8 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 8 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
5 USGS-backed sources
8 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily groundwater
Groundwater commonly picks up calcium and magnesium after contact with rock and soil. This profile is weighted by known population served across matched systems.
Data recency
March 9, 2026
Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 95565

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

8 water systems
PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.
Eureka, City Of
CA1210004
Moderately Hard
154 PPMgroundwater27,078 servedHigh Confidence — USGS Monitoring
Arcata, City Of
CA1210001
Slightly Hard
107 PPMgroundwater20,875 servedHigh Confidence — USGS Monitoring
Humboldt C.S.D.
CA1210009
Slightly Hard
118 PPMgroundwater19,807 servedEstimated — County Avg
Mckinleyville C.S.D.
CA1210016
Moderately Hard
156 PPMgroundwater16,900 servedHigh Confidence — USGS Monitoring
Fortuna, City Of
CA1210006
Hard
208 PPMgroundwater12,133 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

955621429552814395571143955471439554014395569143955361439554514395558143955491439555414395553143

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Moderately Hard Water

Your water is moderately hard. You're likely seeing scale buildup on fixtures, spotty dishes, and may notice dry skin or hair. A water softener or conditioner can help.

Recommended Products

Water Hardness Test Kit
Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)
Salt-Free Water Conditioner
Our PickSpringWell Salt-Free Cartridge
Salt-Based Water Softener
Our PickAFWFilters Fleck 5600SXT 48KAlso GreatWhirlpool WHES40E 40KAlso GreatAFWFilters 64K GrainAlso GreatAFWFilters Iron Pro 2 64KAlso GreatSpringWell Filter + Softener Combo
Shower Head Filter
Our PickWeddell DuoAlso GreatAquaBliss SF100Also GreatSprite Pure 7-SettingAlso GreatAqua Earth 20-Stage

Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How to Test Your Water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Scotia, CA (95565).

Submit Your Data

Frequently Asked Questions

Is the water hard in Scotia, CA (95565)?

The average water hardness in 95565 is 143 PPM (8.3 GPG), which is classified as moderately hard.

Do I need a water softener in 95565?

With hardness of 143 PPM, a water softener is worth considering for homes in 95565.

Is hard water in 95565 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 95565?

Zip code 95565 in Scotia, California is served by 8 water systems.

Learn More About Your Water

Do You Need a Water Softener? (Based on Your Water Hardness)

A data-driven guide to help you decide if a water softener is worth the investment based on your actual water hardness level.

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Salt-Based vs Salt-Free Water Softener: Which Do You Need?

Salt-based softeners remove hardness minerals. Salt-free conditioners prevent scale but don't soften. Here's how to choose based on your water hardness level.

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Best Shower Filters for Hard Water (2026 Reviews)

We tested KDF, Vitamin C, and carbon shower filters for hard water. Here are the filters that actually reduce mineral buildup on hair and skin.

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