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Environmental Health
5050 Commerce Drive
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(888) 700-9995

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Recommended Chemical Levels in Swimming Pools and Spas

  Minimum Ideal Maximum
Free chlorine residual Pools 2.0 2.0 - 3.0 Per Label to 10.0
Free chlorine residual, Spas Wading pools and Spray Grounds 3.0 3.0 - 4.0 Per Label to 10.0
Combined chlorine 0 0 0.4
Bromine, Pools 2 4.5 - 6.5 Per Label to 22.0
Bromine, Spas Wading pools and Spray Grounds 4 6.5 - 7.5 Per Label to 22.0
Oxidation-reduction Potential (ORP) 650 mV - 900 mV
pH 7.2 7.4 - 7.6 7.8
Cyanuric acid 0 30 - 50 100
Total alkalinity 80 100 - 150 180
Calcium Hardness 150 200 - 300 500
Copper 0 0 0.3
Iron 0 0 0.2
Total dissolved solids:
Swimming pools
Spa pools



2,000 over start
1,500 over start

All readings are in parts per million unless otherwise indicated.

Note: Currently, the legal minimum free chlorine residual in public pools in California is 1.0 ppm for pools not using stabilizer (cyanuric acid) and 2.0 ppm for pools using stabilizer.

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Director of
Environmental Health
Terri S. Williams
Public Health has made reasonable efforts to provide accurate translation. However, no computerized translation is perfect and is not intended to replace traditional translation methods. If questions arise concerning the accuracy of the information, please refer to the English edition of the website, which is the official version.
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