California Department of Resources Recycling and Recovery (CalRecycle) 

Closed, Illegal and Abandoned (CIA) Disposal Sites

Disposal Site Classification Chart

Primary Classification

Each CIA site should be given one of the following primary classification (letter) codes.

Code Description
A Confirmed Pollution or nuisance from landfill gas or leachate seep, exposed burn ash, or exposed combustible or putrescible garbage and rubbish.
B Release or suspected release of landfill gas or leachate seep with threat of nuisance or pollution, or inadequate cover of burn ash.
C No confirmed release of landfill gas or leachate seep or no release of landfill gas or leachate seep with significant threat of pollution or nuisance.  Adequate cover for burn ash. Minimal action needed to prevent human contact with waste.
D No threat to public health and safety or the environment (e.g., inert waste site, very old closed site with no potential for landfill gas or leachate migration, clean closed site).
U Unconfirmed site (e.g., site which can neither be confirmed nor denied as a solid waste disposal site).
X Not a solid waste disposal site (e.g., hazardous waste site regulated by DTSC, proposed/never built site, non-disposal site).

Secondary Classification

Only CIA sites with primary category codes of A, B, or C should be given a secondary classification (number) code.

Code Description
1 Inhabitable structures or planned improvements within 1000 feet of site.
2 Significant residential, commercial, industrial, park, recreation, or environmentally sensitive areas within one mile of site.
3 Rural area.


Pollution. The condition caused by the presence in or on a body of water, soil, or air of any solid waste or substance derived there from in such quantity, of such nature and duration, or under such condition that the quality, appearance, or usefulness of the water, soil, land, or air is significantly degraded or adversely altered (PRC section 40171).

Nuisance. Includes anything which is injurious to human health or is indecent or offensive to the senses and interferes with the comfortable enjoyment of life or property, and affects at the same time an entire community, neighborhood, household or any considerable number of persons although the extent of annoyance or damage inflicted upon an individual may be unequal and which occurs as a result of the storage, removal, transport, processing or disposal of solid waste (27 CCR 20164).

Site Characterization

Last updated: January 10, 2000
Closed, Illegal, and Abandoned (CIA) Disposal Sites,
Glenn Young: (916) 341-6696