WAC 246-260-999. Appendix A—Water quality standards

Table 111.1 Minimum and Maximum Levels of Disinfectant (ppm)* swimming pool : *** Minimum Chlorine 1.5 Chlorine with cyanurate compound 2.0 Bromine 2.5 swimming pool : *** Minimum Chlorine 1.5 Chlorine with cyanurate compound 2.0 Bromine 2.5 spa & wading pool: *** Minimum Chlorine 3.0 Chlorine with cyanurate compound 3.5 Bromine 4.0 spa & wading pool: *** Minimum Chlorine 3.0 Chlorine with cyanurate compound 3.5 Bromine 4.0 * Chlorine is measured as free available chlorine residual. ** Recirculating spray pools and sensory deprivation tanks shall meet spa and wading pool levels. *** The maximum disinfectant level shall conform with manufacturers' recommendations and shall not exceed 10 ppm for any pool. * Chlorine is measured as free available chlorine residual. ** Recirculating spray pools and sensory deprivation tanks shall meet spa and wading pool levels. *** The maximum disinfectant level shall conform with manufacturers' recommendations and shall not exceed 10 ppm for any pool. Table 111.2 Acceptable Ranges of Selected Chemical and Physical Water Quality Constituents chemical or physical constituent minimum maximum pH (Hydrogen ion) 7.2 8.0 Water clarity (safety) Main drain and pool bottom visible at all times - Turbidity (shielding microorganisms T.U.)* - 0.5 Cyanuric acid or its derivatives 0 90 ppm Temperature** - 104°F Combined chlorine - 50% of free chlorine Ozone*** - .05 Ionizers (Copper/Silver) - 1.0/.05 chemical or physical constituent minimum maximum pH (Hydrogen ion) 7.2 8.0 Water clarity (safety) Main drain and pool bottom visible at all times - Turbidity (shielding microorganisms T.U.)* - 0.5 Cyanuric acid or its derivatives 0 90 ppm Temperature** - 104°F Combined chlorine - 50% of free chlorine Ozone*** - .05 Ionizers (Copper/Silver) - 1.0/.05 * In peak periods, turbidity may increase to 1.0 T.U. provided turbidity returns to 0.5 T.U. within a six-hour period following peak use. Turbidity is not a required routine analysis. The local health officer may require turbidity monitoring if special conditions warrant. ** A pool facility thermometer shall be provided when the water temperature exceeds 95 degrees Fahrenheit. *** Atmospheric measurement. * In peak periods, turbidity may increase to 1.0 T.U. provided turbidity returns to 0.5 T.U. within a six-hour period following peak use. Turbidity is not a required routine analysis. The local health officer may require turbidity monitoring if special conditions warrant. ** A pool facility thermometer shall be provided when the water temperature exceeds 95 degrees Fahrenheit. *** Atmospheric measurement. Table 111.3 Required Ranges of Accuracy and Incremental Readings for Field Test Kits chemical test minimum test kit range minimum required increments on kits minimum accuracy Free and total available chlorine and total bromine 0.5 - 10.0 ppm* These increments are required to be on the test kit: 0.5, 1.0, 1.5, 2.0, 3, 5, 6, 10 ppm ±50% of the difference of incremental readings pH (hydrogen ion) 7.0 - 8.2 Maximum increments of 0.4, e.g., 7.0, 7.4, 7.8, 8.2, Preferred increments of 0.2, e.g., 7.0, 7.2…. 8.0, 8.2 ±50% of the difference of incremental readings Cyanuric acid 20 - 100 ppm 20 ppm ±10 Alkalinity 0 - 300 ppm 20 ppm ±10 Temperature 60 - 110°F Shall have increments of less than or equal to 2°F, e.g., 60, 62, 64 … 108, 110 ±2°F chemical test minimum test kit range minimum required increments on kits minimum accuracy Free and total available chlorine and total bromine 0.5 - 10.0 ppm* These increments are required to be on the test kit: 0.5, 1.0, 1.5, 2.0, 3, 5, 6, 10 ppm ±50% of the difference of incremental readings pH (hydrogen ion) 7.0 - 8.2 Maximum increments of 0.4, e.g., 7.0, 7.4, 7.8, 8.2, Preferred increments of 0.2, e.g., 7.0, 7.2…. 8.0, 8.2 ±50% of the difference of incremental readings Cyanuric acid 20 - 100 ppm 20 ppm ±10 Alkalinity 0 - 300 ppm 20 ppm ±10 Temperature 60 - 110°F Shall have increments of less than or equal to 2°F, e.g., 60, 62, 64 … 108, 110 ±2°F * Operators who demonstrate the ability to accurately perform test kit dilutions may be allowed to use test kits with a chlorine range of 1.5 - 5.0 ppm, thereby using dilutions to read up to 10 ppm.