Washington Administrative Code
Title 246 - Health, Department of
RECREATIONAL WATER
Chapter 246-260 - Water recreation facilities
ADMINISTRATIVE RULES
Section 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 |
|
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. 04-18-096, § 246-260-999, filed 9/1/04, effective 10/31/04.
