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Water Test Result Interpreter

08 / 08

Screen residential pool pH, free chlorine, total alkalinity, and calcium hardness against clearly stated reference bands.

FormulaScreening only: each result is compared with its stated reference band

Enter your values

Calculated result

Result—Enter valid values

A

How the calculation works

Select the pool type and surface, then enter current test values. The tool reports whether each result is below, within, or above the displayed screening band and identifies which measurement should be reviewed first.

B

Limits and responsible use

This tool is for pool-water screening only. It does not determine drinking-water safety, microbial safety, regulatory compliance, or chemical compatibility. Test method quality, cyanuric acid, temperature, bather load, and local code can change the appropriate operating range.

Formula reference

The calculation and interpretation are presented with their assumptions so the result can be independently checked.

View CDC home pool and hot tub water treatment and testing ↗
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