Hardness
Moderately Hard
108.1 PPM · 6.3 GPG
Local water dashboard
Official source aggregationWater quality in Derby, KS 67037
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Sedgwick County.
1 reported benchmark flag
- Primary matched system
- Derby, City Of
- Source water
- Surface water
- County
- Sedgwick 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
0.0013 mg/L
9% of action level
Utility match
2 systems
Serves 25,413 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
108.1 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
108.1
mg/L as CaCO₃ equivalent
Grains per gallon
6.3
1 GPG ≈ 17.1 PPM
What this means at home
At 108.1 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
10
Nearest site
3.4 mi
Observation range
Jan 19, 2016–Jun 3, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: McConnell C at 47th St, Wichita, KS (Stream).USGS source documentation ↗
Regional context
Is 67037 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Derby median
108 PPM
About the same1 indexed ZIP readings · Range 108.1–108.1 PPM
Kansas median
289 PPM
181 PPM lower540 indexed ZIP readings · Range 72.2–707 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)
0.0013 mg/L
Reported Dec 31, 2024
Copper (CU90)
1.41 mg/L
Reported Dec 31, 1993
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0013
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.41
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 13
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | KS2017306 | Archived | Jun 1, 2025through Jun 30, 2025 |
| Chlorine | KS2017306 | Archived | Jun 1, 2025through Jun 30, 2025 |
| Revised Total Coliform Rule | KS2017306 | Resolved | Jan 1, 2025through Apr 2, 2025 |
| Chlorine | KS2017306 | Resolved | Dec 1, 2024through Dec 31, 2024 |
| Revised Total Coliform Rule | KS2017306 | Resolved | Dec 1, 2023through Dec 31, 2023 |
| Chlorine | KS2017306 | Resolved | Oct 1, 2023through Dec 31, 2023 |
| Public Notice | KS2017328 | Resolved | Oct 6, 2022through May 30, 2023 |
| Total Haloacetic Acids (HAA5) | KS2017328 | Resolved | Jun 1, 2022through Aug 31, 2022 |
| TTHM | KS2017328 | Resolved | Jun 1, 2022through Aug 31, 2022 |
| Total Haloacetic Acids (HAA5) | KS2017328 | Resolved | Jun 1, 2021through Aug 31, 2021 |
| TTHM | KS2017328 | Resolved | Jun 1, 2021through Aug 31, 2021 |
| TTHM | KS2017328 | Resolved | Mar 1, 2021through May 31, 2021 |
| Total Haloacetic Acids (HAA5) | KS2017328 | Resolved | Mar 1, 2021through May 31, 2021 |
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 Derby ZIP 67037 using 108.1 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 Derby
Is tap water safe in Derby?+
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 108.1 PPM, or 6.3 grains per gallon, classified as moderately hard. 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.