Pretreatment & Source Control

The Non-Reclaimable Waste System and Its Local Discharge Limits

The Agency operates the Non-Reclaimable Waste System (NRWS) to collect industrial wastewater discharges that are high in salts or chemicals that may not be economical for reclamation. To be eligible to use the NRWS, the wastewater must have a total dissolved solids (TDS) of 550 mg/l or more.

The wastewater collected by the NRWS is conveyed to treatment facilities operated by the County Sanitation District of Los Angeles County (CSDLAC) or County Sanitation Districts of Orange County (CSDOC) for treatment and, eventually, discharge to the Pacific Ocean.

The NRWS itself is referred to as North NRWS and South NRWS. The North NRWS is to collect discharges from industries located in the northern service area (City of Montclair, Upland, Rancho Cucamonga, Ontario and Fontana) while the South NRWS is to collect discharges from industries located in the southern service side (City of Chino).

The local discharge limits for industries discharging to the North NRWS are set by CSDLAC and adopted by the Agency. These limits are showed in Table I.

Table I - Limits for Industries Discharging Wastewater to the North NRWS
Pollutants	Limits (mg/l unless otherwise indicated)
Arsenic (Total)	3
Cadmium (Total)	15
Chromium (Total)	10
Copper (Total)	15
Lead (Total)	40
Mercury (Total)	2
Nickel (Total)	12
Zinc (Total)	25
Cyanide (Total)	10
Sulfides (Dissolved)	0.1
Oil & Grease	Limits established on a case by case basis
pH	Greater than 6 and less than 12.4 Standard Units
Total Identifiable Chlorinated Hydrocarbons (TICH)	Essentially None

The local discharge limits for industries discharging to the South NRWS are set by CSDOC and SAWPA. These local limits are also adopted by the Agency and showed in Table II.

Table II - Limits for Industries Discharging Wastewater to the South NRWS
Pollutants	Limits (mg/l unless otherwise indicated)
Arsenic (Total)	2.0
Cadmium (Total)	1.0
Chromium (Total)	2.0
Copper (Total)	3.0
Lead (Total)	2.0
Mercury (Total)	0.03
Nickel (Total)	10.0
Silver (Total)	5.0
Zinc (Total)	10.0
Cyanide (Total)	5.0
Cyanide (Amenable to chlorination)	1.0
Polychlorinated Biphenyls (PCBs - Total)	0.01
Pesticides (Total)	0.01
Total Toxic Organics	0.58
Sulfides (Total)	5.0
Sulfides (Dissolved)	0.5
Oil & Grease of mineral, petroleum origin	100
pH	Greater than 6 and less than 12.0 Standard Units