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246-260-998  <<  246-260-999 >>   246-260-99901

WAC 246-260-999

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Appendix AWater 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
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.
[Statutory Authority: Chapters 70.90 and 43.20 RCW. WSR 04-18-096, § 246-260-999, filed 9/1/04, effective 10/31/04.]