Hardness
Very Hard
253.5 PPM · 14.8 GPG
Local water dashboard
Official source aggregationWater quality in Farmington, MO 63640
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for St. Francois County.
2 reported benchmark flags
- Primary matched system
- Farmington Pws
- Source water
- Groundwater
- County
- St. Francois 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
2 systems
Serves 18,217 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
253.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
253.5
mg/L as CaCO₃ equivalent
Grains per gallon
14.8
1 GPG ≈ 17.1 PPM
What this means at home
At 253.5 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
18
Nearest site
19.3 mi
Observation range
Mar 1, 2016–Aug 23, 2023
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: T38N R08E 27BCD (Well).USGS source documentation ↗
Regional context
Is 63640 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Farmington median
254 PPM
About the same1 indexed ZIP readings · Range 253.5–253.5 PPM
Missouri median
236 PPM
18 PPM higher556 indexed ZIP readings · Range 38.3–483 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 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
Local 0
EPA limit 0.015
Combined Radium (-226 and -228)
Measured in PCI/L
Local 5.53
EPA limit 5
TTHM
Measured in UG/L
Local 98.78
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 15
- Health-based
- 5
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | MO4010270 | Unaddressed | Mar 2, 2026 |
| Lead and Copper Rule | MO4069041 | Unaddressed | Oct 19, 2025 |
| LEAD AND COPPER RULE REVISIONS | MO4069041 | Unaddressed | Jul 2, 2025 |
| Consumer Confidence Rule | MO4069041 | Unaddressed | Jul 1, 2025 |
| Public Notice | MO4069041 | Resolved | Apr 28, 2025through Sep 18, 2025 |
| Public Notice | MO4069041 | Resolved | Feb 19, 2025through Sep 18, 2025 |
| Combined Radium (-226 and -228)Health-basedReported 5.53 PCI/L · MCL 5 | MO4010270 | Resolved | Oct 1, 2024through Sep 30, 2025 |
| TTHMHealth-basedReported 98.78 UG/L · MCL 0.08 | MO4069041 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Combined Radium (-226 and -228)Health-basedReported 5.83 PCI/L · MCL 5 | MO4010270 | Resolved | Jul 1, 2024through Jun 30, 2025 |
| TTHMHealth-basedReported 107.5 UG/L · MCL 0.08 | MO4069041 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| TTHMHealth-basedReported 107.5 UG/L · MCL 0.08 | MO4069041 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Consumer Confidence Rule | MO4010270 | Resolved | Jul 1, 2022through Mar 6, 2023 |
| Consumer Confidence Rule | MO4069041 | Resolved | Jul 1, 2022through Jan 4, 2023 |
| Consumer Confidence Rule | MO4010270 | Resolved | Jul 1, 2021through Feb 28, 2022 |
| Consumer Confidence Rule | MO4069041 | Resolved | Jul 1, 2021through Jan 19, 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 Farmington ZIP 63640 using 253.5 PPM nearby hardness and 3 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
253.5 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 systemsDrinking water protection
Under-Sink Reverse Osmosis System
Combined Radium (-226 and -228), TTHM 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 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 Farmington
Is tap water safe in Farmington?+
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 253.5 PPM, or 14.8 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 253.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.