Saint John Water Hardness & Quality Report (2026)
Water Hardness
9.3 grains per gallon
Source
river
pH Level
7.9
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
283.5 mg/L
Est. Daily Cost
$0.42
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Saint John, your appliances are currently losing 21% efficiency due to mineral buildup.
| Appliance | In Saint John | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.4 yrs | 8.5 yrs | -48% |
| Washing Machine | 7.7 yrs | 12 yrs | -36% |
| Water Heater | 9.3 yrs | 15 yrs | -38% |
Regional Water Comparison
How Saint John compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Saint John, Indiana | 158.5 mg/L | 4.7 ppt | 🟠 Hard | river |
| Schererville, Indiana | 181.5 mg/L | 5.6 ppt | 🔴 Very Hard | river |
| Dyer, Indiana | 268 mg/L | 8.7 ppt | 🔴 Very Hard | river |
| Griffith, Indiana | 180 mg/L | 5.5 ppt | 🔴 Very Hard | river |
| Highland, Indiana | 206 mg/L | 6.5 ppt | 🔴 Very Hard | river |
National Benchmark
How Saint John compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint John | 158.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Saint John's Water Unique?
Local geology and source profile
Saint John, Indiana, in Lake County — a Lake County town adjacent to Schererville and Dyer in the south Chicago metro near the Illinois border — receives its water from the Saint John Water Division or Hammond Water Works, drawing from Lake Michigan (Lake County treatment plant) or local Lake County groundwater through the northwest Indiana distribution.
The hard 158.5 mg/L hardness and TDS of 283.5 mg/L are harder than the Chicago metro Lake Michigan supply (Ukrainian Village: 123.5 mg/L) — reflecting either local Lake County limestone aquifer groundwater contribution or the northwest Indiana distribution system's slightly different blend. The Lake County water system includes Lake Michigan input (Silurian dolomite character) and local Silurian Niagara Dolomite and Ordovician Trenton Limestone aquifer (calcareous-dolomitic — primary hardness contributor at the northwest Indiana position).
At 158.5 mg/L, Saint John's water is hard — scale builds steadily in kettles and appliances, dishwashers benefit from rinse aid, and water heaters should be descaled annually. Monthly descaling is recommended. The PFAS level of 4.7 ppt warrants a certified drinking water filter — the Lake County northwest Indiana south Chicago metro industrial corridor and the Lake Michigan PFAS background from the Chicago-Gary industrial complex contribute to Saint John's readings.
Geology & Source: Saint John in Lake County draws from the Saint John Water Division on the Kankakee River or local Lake County groundwater (Lake County, northwest Indiana) — the Lake County water system integrates Lake Michigan water blended with local aquifer supplies — Indiana Lake County Lake Michigan-local aquifer supply produces hard water at 158.5 mg/L with TDS 283.5 mg/L.