Hardness
Soft
57.8 PPM · 3.4 GPG
Local water dashboard
Official source aggregationWater quality in Longview, WA 98632
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Cowlitz County.
1 reported benchmark flag
- Primary matched system
- Longview Water Department
- Source water
- Groundwater
- County
- Cowlitz County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0 mg/L
0% of action level
Utility match
1 system
Serves 57,617 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
57.8 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
57.8
mg/L as CaCO₃ equivalent
Grains per gallon
3.4
1 GPG ≈ 17.1 PPM
What this means at home
At 57.8 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
13
Nearest site
50.3 mi
Observation range
Aug 22, 2016–Dec 7, 2016
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 16N/02E-20N01 SU-011 (Well).USGS source documentation ↗
Regional context
Is 98632 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Longview median
58 PPM
About the same1 indexed ZIP readings · Range 57.8–57.8 PPM
Washington median
104 PPM
46 PPM lower189 indexed ZIP readings · Range 20.6–238 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass1 fail
Lead (PB90)
0 mg/L
Reported Dec 31, 2023
Copper (CU90)
1.6 mg/L
Reported Dec 31, 1995
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.6
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 4
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Consumer Confidence Rule | WA5348100 | Resolved | Jul 1, 2025through Sep 25, 2025 |
| Consumer Confidence Rule | WA5348100 | Resolved | Jul 1, 2022through Apr 25, 2024 |
| TTHM | WA5348100 | Resolved | Jan 1, 2022through Mar 31, 2022 |
| Consumer Confidence Rule | WA5348100 | Resolved | Jul 1, 2021through Apr 25, 2024 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Longview ZIP 98632 using 57.8 PPM nearby hardness and 2 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile) has a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Longview
Is tap water safe in Longview?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Nearby USGS observations produce an estimate of 57.8 PPM, or 3.4 grains per gallon, classified as soft. This is not a household tap measurement.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.