Wash. Admin. Code § 246-260-999
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 |
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. |
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 |
* | 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 |
* | 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. |
Wash. Admin. Code § 246-260-999
Statutory Authority: Chapters 70.90 and 43.20 RCW. 04-18-096, § 246-260-999, filed 9/1/04, effective 10/31/04.