Skip to content

Local water dashboard

Official source aggregation

Water quality in Fairfax, OK 74637

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

2 reported benchmark flags
Primary matched system
Fairfax
Source water
Surface water
County
Osage County
Profile updated

At a glance

What the current records say

Hardness

Very Hard

263 PPM · 15.4 GPG

Compliance screen

No active flag

0 active health-based records

Lead 90th percentile

0.0023 mg/L

15% of action level

Utility match

1 system

Serves 1,555 people system-wide

Hardness meter

How hard is the water?

Very Hard

Estimated local hardness

USGS hardness classification scale

263 PPM

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

Parts per million

263

mg/L as CaCO₃ equivalent

Grains per gallon

15.4

1 GPG ≈ 17.1 PPM

What this means at home

At 263 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

35

Nearest site

3.7 mi

Observation range

Jun 30, 2016–Aug 8, 2018

Estimate confidence

Moderate

Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 24N-06E-22 BAB 1 (Well).USGS source documentation ↗

Regional context

Is 74637 typical?

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

Fairfax median

263 PPM

About the same

1 indexed ZIP readings · Range 263–263 PPM

Oklahoma median

226 PPM

37 PPM higher

148 indexed ZIP readings · Range 7–610 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 pass2 fail

Lead (PB90)

0.0023 mg/L

Reported Dec 31, 2025

Copper (CU90)

Not available

No numerical 90th-percentile result

Numerical coverage

3 comparable results

Missing values remain blank; absence is not treated as a pass.

Lead (90th percentile)

Measured in mg/L

Pass

Local 0.0023

EPA limit 0.015

Local level is 15% of the listed EPA limit.

TTHM

Measured in MG/L

Fail

Local 0.081

EPA limit 0.08

Local level is 101% of the listed EPA limit.

Total Haloacetic Acids (HAA5)

Measured in MG/L

Fail

Local 0.062

EPA limit 0.06

Local level is 103% 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
79
Health-based
40
Active health-based
0
Contaminant or ruleSystemStatusPeriod
CARBON, TOTALHealth-basedReported 0.8 RATIOOK1021204ResolvedJul 1, 2024through Sep 30, 2024
CARBON, TOTALHealth-basedReported 0.7 RATIOOK1021204ResolvedApr 1, 2024through Jun 30, 2024
CARBON, TOTALHealth-basedReported 0.68 RATIOOK1021204ResolvedJan 1, 2024through Mar 31, 2024
CARBON, TOTALHealth-basedReported 0.5 RATIOOK1021204ResolvedOct 1, 2023through Dec 31, 2023
TTHMHealth-basedReported 0.081 MG/L · MCL 0.08OK1021204ArchivedOct 1, 2023through Dec 31, 2023
TTHMHealth-basedReported 0.097 MG/L · MCL 0.08OK1021204ResolvedJul 1, 2023through Sep 30, 2023
CARBON, TOTALHealth-basedReported 0.71 RATIOOK1021204ArchivedJul 1, 2023through Sep 30, 2023
TTHMHealth-basedReported 0.1 MG/L · MCL 0.08OK1021204ArchivedJul 1, 2023through Sep 30, 2023
TTHMHealth-basedReported 0.13 MG/L · MCL 0.08OK1021204ResolvedApr 1, 2023through Jun 30, 2023
TTHMHealth-basedReported 0.131 MG/L · MCL 0.08OK1021204ResolvedApr 1, 2023through Jun 30, 2023
CARBON, TOTALHealth-basedReported 0.93 RATIOOK1021204ResolvedApr 1, 2023through Jun 30, 2023
TTHMHealth-basedReported 0.129 MG/L · MCL 0.08OK1021204ResolvedJan 1, 2023through Mar 31, 2023
TTHMHealth-basedReported 0.128 MG/L · MCL 0.08OK1021204ArchivedJan 1, 2023through Mar 31, 2023
CARBON, TOTALHealth-basedReported 0.95 RATIOOK1021204ResolvedJan 1, 2023through Mar 31, 2023
TTHMHealth-basedReported 0.116 MG/L · MCL 0.08OK1021204ArchivedOct 1, 2022through Dec 31, 2022
CARBON, TOTALHealth-basedReported 0.94 RATIOOK1021204ArchivedOct 1, 2022through Dec 31, 2022
Gross Alpha, Excl. Radon and UOK1021204ResolvedOct 1, 2022through Dec 31, 2022
TTHMHealth-basedReported 0.117 MG/L · MCL 0.08OK1021204ResolvedOct 1, 2022through Dec 31, 2022
Combined UraniumOK1021204ResolvedOct 1, 2022through Dec 31, 2022
Combined Radium (-226 and -228)OK1021204ResolvedOct 1, 2022through Dec 31, 2022

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 Fairfax ZIP 74637 using 263 PPM nearby hardness and 3 reported measurement benchmarks.

2 matches

Scale protection

High-Capacity Whole House Water Softener

263 PPM is 2× 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

TTHM, Total Haloacetic Acids (HAA5) have 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 Fairfax

Is tap water safe in Fairfax?+

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 263 PPM, or 15.4 grains per gallon, classified as very hard. This is not a household tap measurement.

Do I need a water softener?+

At 263 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.