Pure Aqua Columbus
Pure Aqua Columbus Field DataField Test Report

Columbus ZIP 43204 Water Quality Report

Franklin County, Ohio  ·  2 in-home tests

Extremely HardRank #5 of 37 ZIPsLast verified:
Not municipal data — these are tap measurements after distribution, not treatment plant output.

Average hardness

16.9gpg averageExtremely Hard
Range: 16.1 – 17.6 gpg  ·  Median: 16.9 gpg
0 gpg (soft)22+ gpg (extremely hard)
National avg: 6 gpg · Central Ohio avg: ~14 gpg
0
Iron
mg/L avg
7.7
pH
avg pH
315
TDS
mg/L avg
—
Chlorine
mg/L avg

Iron

0mg/L avg
2 tests
EPA secondary standard: 0.3 mg/L

Top homeowner complaints

Primary problem reported when scheduling a free water test.

White spots on dishes/fixtures
50%
1 tests
Water heater scale / efficiency loss
50%
1 tests

Hardness distribution

Breakdown of all tested homes by hardness tier.

Extremely Hard (14+ gpg)
2
Very Hard (10.5–14 gpg)
0
Hard (7–10.5 gpg)
0
Moderate (3.5–7 gpg)
0
Soft (0–3.5 gpg)
0

Monthly hardness trend

Average hardness gpg per month across all tests in this ZIP.

MonthAvg gpgTests
16.11
17.61

Treatment adoption

100%
of tested homes in this ZIP chose to install a water treatment system.

How this ZIP compares

Hardness ranking within the Pure Aqua Columbus service area.

#5
of 37 ZIPs by hardness
16.9
gpg vs ~14 regional avg
2
field tests in this ZIP

Frequently asked questions — Columbus 43204

How hard is the water in ZIP code 43204?▾
Pure Aqua Columbus field tests show an average hardness of 16.9 grains per gallon (gpg) in ZIP 43204 — classified as extremely hard. The range across 2 tests was 16.1 to 17.6 gpg. For context, the national average is about 6 gpg and most of Central Ohio runs 12–18 gpg.
Is the water in Columbus (43204) safe to drink?▾
Hardness is not a health concern — it's a mineral content issue that affects appliances, fixtures, and skin. Columbus water at 16.9 gpg is extremely hard, which means scale buildup on water heaters, dishwashers, and faucets is likely. Iron levels are within normal range. For drinking water quality, contact Columbus Water Works or your local utility for the annual Consumer Confidence Report.
What water treatment do homes in 43204 typically need?▾
Based on 2 Pure Aqua Columbus tests in ZIP 43204, the most common homeowner complaint was White spots on dishes/fixtures. At 16.9 gpg, a water softener is the most effective solution for hardness. 100% of tested homes in this ZIP chose to install a treatment system.
How does 43204 compare to other Central Ohio ZIP codes?▾
ZIP 43204 ranks #5 out of 37 ZIP codes in the Pure Aqua Columbus service area by average hardness (16.9 gpg). This is among the harder ZIPs in the region.
How was this water data collected for ZIP 43204?▾
These results come from anonymized Pure Aqua Columbus in-home water tests performed by WQA-certified technicians using calibrated Hach and LaMotte test kits. No names, addresses, or identifying information are stored — location is coarsened to ZIP code and dates to month precision. This is independent field data, not municipal utility data.

About this data

Results are anonymized field measurements from Pure Aqua Columbus in-home water tests performed by WQA-certified technicians using calibrated Hach and LaMotte test kits. No names, addresses, or identifying information are stored — location is coarsened to ZIP code and dates to month precision. This data is independent of Columbus Water Works, Delaware County District Water, or Ohio EPA Consumer Confidence Reports.

View full 2026 Central Ohio report →Browse all ZIP reports

Get your home's exact numbers

ZIP averages don't tell the full story — your home's water can vary by street, plumbing age, and season. A free in-home test takes 30 minutes and gives you hardness, iron, pH, TDS, and chlorine at your tap.

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