Where does the water in 95618 come from?

Water for zip code 95618 in El Macero, California is provided by 4 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 95618

El Macero, California · Yolo County

191 PPM

11.2 GPG

Hard

0Soft60120180300+

Verified — State Lab Tested

Dataset updated March 9, 2026Matched to 4 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 4 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

1 verified treated-water source

4 matched systems total for this ZIP; treated-water reports are prioritized when available.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

Report years 2024

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 95618

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.

4 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.

Water System	Source	Hardness	Pop. Served	Data Source
City Of Davis CA5710001	surface water	251 PPM Very Hard	67,457	High Confidence — USGS Monitoring
City Of Woodland CA5710006	surface water	202 PPM Hard	61,462	High Confidence — USGS Monitoring
City Of West Sacramento CA5710003	surface water	49 PPM Soft USGS estimate: 108 PPM	53,355	Verified — State Lab Tested(2024)
Uc - Davis CA5710009	surface water	251 PPM Very Hard	49,616	High Confidence — USGS Monitoring

City Of Davis

CA5710001

Very Hard

251 PPMsurface water67,457 servedHigh Confidence — USGS Monitoring

City Of Woodland

CA5710006

Hard

202 PPMsurface water61,462 servedHigh Confidence — USGS Monitoring

City Of West Sacramento

CA5710003

Soft

49 PPMsurface water53,355 servedVerified — State Lab Tested

Source water: 108 PPM

Uc - Davis

CA5710009

Very Hard

251 PPMsurface water49,616 servedHigh Confidence — USGS Monitoring

Nearby Zip Codes

95616191 95691191 95605191 9583170 95620169 9581870 9583370 9582270 9581470 95776191 9583470 9583770

What This Means For You

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

Hard Water - Treatment Recommended

Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.

Recommended Products

Salt-Based Water Softener

Our PickAFWFilters Fleck 5600SXT 48K Also GreatWhirlpool WHES40E 40K Also GreatAFWFilters 64K Grain Also GreatAFWFilters Iron Pro 2 64K Also GreatSpringWell Filter + Softener Combo

Salt-Free Water Conditioner

Our PickSpringWell Salt-Free Cartridge

Water Hardness Test Kit

Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)

Shower Head Filter

Our PickWeddell Duo Also GreatAquaBliss SF100 Also GreatSprite Pure 7-Setting Also GreatAqua Earth 20-Stage

Water Softener Salt

Our PickMorton Clean & Protect Also GreatDiamond Crystal Bright & Soft

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 El Macero, CA (95618).

Submit Your Data

Frequently Asked Questions

Is the water hard in El Macero, CA (95618)?

The average water hardness in 95618 is 191 PPM (11.2 GPG), which is classified as hard.

Do I need a water softener in 95618?

With hardness of 191 PPM, a water softener is recommended for homes in 95618.

Is hard water in 95618 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 95618?

Zip code 95618 in El Macero, California is served by 4 water systems.