Hardness
Very Hard
308 PPM · 18 GPG
Local water dashboard
Official source aggregationWater quality in Pontiac, IL 61764
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Livingston County.
1 reported benchmark flag
- Primary matched system
- Il American-Pontiac
- Source water
- Surface water
- County
- Livingston 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
0.0011 mg/L
7% of action level
Utility match
3 systems
Serves 11,864 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
308 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
308
mg/L as CaCO₃ equivalent
Grains per gallon
18
1 GPG ≈ 17.1 PPM
What this means at home
At 308 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
48.3 mi
Observation range
Apr 26, 2016–Apr 27, 2016
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: DES PLAINES RIVER AB CEDAR CR NR MILLSDALE, IL (Stream).USGS source documentation ↗
Regional context
Is 61764 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Pontiac median
308 PPM
About the same1 indexed ZIP readings · Range 308–308 PPM
Illinois median
285 PPM
23 PPM higher1065 indexed ZIP readings · Range 115–408 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 Jun 30, 2026
Copper (CU90)
1.362 mg/L
Reported Dec 31, 2017
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0011
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.362
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 16
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | IL1055500 | Unaddressed | Jan 25, 2026 |
| Public Notice | IL1055500 | Unaddressed | Jan 15, 2026 |
| Public Notice | IL1055500 | Unaddressed | Jan 15, 2026 |
| Public Notice | IL1055500 | Unaddressed | Oct 16, 2025 |
| Public Notice | IL1055500 | Unaddressed | Oct 16, 2025 |
| Lead and Copper Rule | IL1055500 | Unaddressed | Jul 1, 2025 |
| TTHM | IL1055500 | Resolved | Apr 1, 2025through Jun 30, 2025 |
| Total Haloacetic Acids (HAA5) | IL1055500 | Resolved | Apr 1, 2025through Jun 30, 2025 |
| Revised Total Coliform Rule | IL1055500 | Resolved | Dec 1, 2024through Dec 31, 2024 |
| Total Haloacetic Acids (HAA5) | IL1055500 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| TTHM | IL1055500 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Total Haloacetic Acids (HAA5) | IL1055500 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| TTHM | IL1055500 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| TTHM | IL1055040 | Resolved | Jan 1, 2023through Dec 31, 2023 |
| Total Haloacetic Acids (HAA5) | IL1055040 | Resolved | Jan 1, 2023through Dec 31, 2023 |
| Lead and Copper Rule | IL1055040 | Resolved | Sep 29, 2021through Oct 20, 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 Pontiac ZIP 61764 using 308 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
308 PPM is 3× 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
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 Pontiac
Is tap water safe in Pontiac?+
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 308 PPM, or 18 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 308 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.