Washington Administrative Code
Title 246 - Health, Department of
WATER SYSTEMS
Chapter 246-292 - Waterworks operator certification
Section 246-292-040 - Classification of public water systems

Universal Citation: WA Admin Code 246-292-040

Current through Register Vol. 24-18, September 15, 2024

The department shall classify water treatment plants and distribution systems.

(1) Water treatment plants.

(a) Water treatment plants are classified according to the point system in the ABC "Purification Plant Criteria" publication (October 2007) and are in Table 1.

Table 1 Water Treatment Plant Classification

Total Points Assigned Water Treatment Plant Classification
Less than 31 Class 1
31 to 55 Class 2
56 to 75 Class 3
More than 75 Class 4

(b) The scope of water treatment plant processes include, but are not limited to:
(i) Water filtration;

(ii) Ion exchange;

(iii) Electrodialysis;

(iv) Reverse osmosis; or

(v) Inorganic contaminant removal.

(c) The scope of a water treatment plant does not include unit processes installed for:
(i) In-line fluoridation;

(ii) In-line chlorination; or

(iii) Chemical addition to inhibit corrosion.

(2) Distribution systems are classified according to the population served from a public water system's WFI form and are in Table 2.

Table 2 Distribution Systems Classification

Population Served Distribution System Classification
Less than 251 Class S
251 to 1,500 Class 1
1,501 to 15,000 Class 2
15,001 to 50,000 Class 3
More than 50,000 Class 4

Statutory Authority: Chapter 70.119 RCW and Safe Drinking Water Act, Public Law 104-182; 64 F.R. 5916 - 5921. 01-02-070, § 246-292-040, filed 12/29/00, effective 1/29/01. Statutory Authority: Chapter 70.119 RCW. 94-04-004, § 246-292-040, filed 1/20/94, effective 2/20/94. Statutory Authority: RCW 43.70.040. 91-02-049 (Order 121), recodified as § 246-292-040, filed 12/27/90, effective 1/31/91. Statutory Authority: RCW 70.119.050. 78-10-053 (Order 1343), § 248-55-050, filed 9/22/78.

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