19 Allocation Schemes

Wasteload Allocation Methods¹
1.	Equal percent removal (equal percent treatment)
2.	Equal effluent concentrations
3.	Equal total mass discharge per day
4.	Equal mass discharger per capita per day
5.	Equal reduction of raw load (pounds per day)
6.	Equal ambient mean annual quality (mg/l)
7.	Equal cost per pound of pollutant removed
8.	Equal treatment cost per unit of production
9.	Equal mass discharged per unit of raw material used
10.	Equal mass discharged per unit of production
11a.	Percent removal proportional to raw load per day
11b.	Larger facilities to achieve higher removal rates
12.	Percent removal proportional to community effective income
13a.	Effluent charges (pounds per week)
13b.	Effluent charge above some load limit
14.	Seasonal limits based on cost-effectiveness analysis
15.	Minimum total treatment cost
16.	Best Available Technology (BAT for industry) plus some level for municipal inputs
17.	Assimilative capacity divided to require an "equal effort among dischargers"
18a.	Municipal: Treatment level proportional to plant size
18b.	Industrial: equal percent between best practicable technology (BPT) and BAT
19.	Industrial discharges given different treatment levels for different stream flows and seasons
¹ Source: Chadderton, R., Miller, A. and A. McDonnell, 1981. Analysis of Wasteload Allocation Procedures. Water Resources Bulletin 17(5):760-66. (As cited in EPA's Technical Support Document for Water Quality-based Toxics Control (PDF) (26.6 Mb, 335 pages), 1991 (EPA/505/2-90-001).)