Reclaimed water performance standards. All Class A and Class B reclaimed water at a minimum must meet the technology-based performance standards listed in Table 1 and Table 2 for the class of reclaimed water generated at the facility. Compliance shall generally be measured at the end of treatment, however, the reclaimed water permit may specify alternative monitoring locations and water quality limits to ensure compliance with performance standards, and any additional use based requirements as listed in Table 3.

Table 1: Minimum Biological Oxidation Performance Standards

Biological Oxidation
Parameter1	Minimum Biological Oxidation Performance Standard
Dissolved Oxygen	Must be measurably present
BOD5	Monthly Average	Weekly Average
BOD5	30 mg/L	45 mg/L
CBOD5	25mg/L	40 mg/L
TSS	30 mg/L	45 mg/L
pH	Minimum	Maximum
pH	6 s.u.	9 s.u.
pH (Groundwater recharge)	6.5 s.u.	8.5 s.u.

1 The parameter must be measured at the end of the unit process or alternative monitoring location as set in a reclaimed water permit.

Table 2: Class A and B Performance Standards

Coagulation/Filtration
Parameter1	Class A Reclaimed Water		Class B Reclaimed Water
Turbidity2	Monthly Average	Sample Maximum	Monthly Average	Sample Maximum
	2 NTU	5 NTU	Not Applicable	Not Applicable
Membrane Filtration
	Class A Reclaimed Water		Class B Reclaimed Water
Turbidity2	Monthly Average	Sample Maximum	Monthly Average	Sample Maximum
	0.2 NTU	0.5 NTU	Not Applicable	Not Applicable
Disinfection
	Class A Reclaimed Water		Class B Reclaimed Water
Total Coliform	7-Day Median	Sample Maximum	7-Day Median	Sample Maximum
	2.2 MPN/100 mL or CFU/100 mL	23 MPN/mL or CFU/mL	23 MPN/mL or CFU/mL	240 MPN/mL or CFU/mL
Virus Removal	See disinfection process standards in WAC 173-219-340		Not Applicable	Not Applicable
Denitrification3
	Class A Reclaimed Water		Class B Reclaimed Water
Total Nitrogen	Monthly Average	Weekly Average	Monthly Average	Weekly Average
	10 mg/L	15 mg/L	Not Applicable	Not Applicable

	1 The parameter must be measured at the end of the unit process or alternative monitoring location as set in a reclaimed water permit.
	2 Sample maximum for turbidity is the highest value for the day that lasts longer than five minutes.
	3 Not applicable for beneficial uses 1-13 listed on Table 3: Use-Based Requirements.

PDFWAC 173-219-330

Performance standards.