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Local water dashboard

Official source aggregation

Water quality in Oberlin, KS 67749

A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Decatur County.

1 reported benchmark flag
Primary matched system
Oberlin, City Of
Source water
Groundwater
County
Decatur County
Profile updated

At a glance

What the current records say

Hardness

Very Hard

674 PPM · 39.4 GPG

Compliance screen

No active flag

0 active health-based records

Lead 90th percentile

0.0011 mg/L

7% of action level

Utility match

1 system

Serves 1,639 people system-wide

Hardness meter

How hard is the water?

Very Hard

Estimated local hardness

USGS hardness classification scale

674 PPM

Soft
0–59Moderate
60–120Hard
121–180Very hard
181+

Parts per million

674

mg/L as CaCO₃ equivalent

Grains per gallon

39.4

1 GPG ≈ 17.1 PPM

What this means at home

At 674 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

3

Nearest site

66.7 mi

Observation range

Jul 30, 2018–Aug 22, 2018

Estimate confidence

Low

Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 04S 18W 26BDC 02 (Well).USGS source documentation ↗

Regional context

Is 67749 typical?

These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.

Oberlin median

674 PPM

About the same

1 indexed ZIP readings · Range 674–674 PPM

Kansas median

289 PPM

385 PPM higher

540 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)

0.0011 mg/L

Reported Dec 31, 2024

Copper (CU90)

1.946 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

Pass

Local 0.0011

EPA limit 0.015

Local level is 7% of the listed EPA limit.

Copper (90th percentile)

Measured in mg/L

Fail

Local 1.946

EPA limit 1.3

Local level is 150% of the listed EPA limit.

Share of EPA benchmark

100% line = listed limit

EPA SDWIS compliance

Reported violation history

Open EPA source documentation ↗
2026Q2
All records
3
Health-based
0
Active health-based
0
Contaminant or ruleSystemStatusPeriod
LEAD AND COPPER RULE REVISIONSKS2003903UnaddressedJul 2, 2025
TTHMKS2003903ResolvedJan 1, 2023through Dec 31, 2023
Total Haloacetic Acids (HAA5)KS2003903ResolvedJan 1, 2023through Dec 31, 2023

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 Oberlin ZIP 67749 using 674 PPM nearby hardness and 2 reported measurement benchmarks.

2 matches

Scale protection

High-Capacity Whole House Water Softener

674 PPM is 6× the high-hardness trigger used by this matcher.

Designed to reduce scale on fixtures, water heaters, glassware, and plumbing throughout the home.

Compare whole-house systems

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 filtration

Affiliate 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 Oberlin

Is tap water safe in Oberlin?+

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 674 PPM, or 39.4 grains per gallon, classified as very hard. This is not a household tap measurement.

Do I need a water softener?+

At 674 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.