Depending on who "owns" the waste, its handling and disposal is regulated differently. All nuclear facilities, whether they are a utility or a disposal site, have to comply with NRC regulations. The three low-level waste facilities in the U.S. are Barnwell, South Carolina, Richland, Washington, and Clive, Utah. The Barnwell and the Clive locations are operated by EnergySolutions, whereas the Richland location is operated by U.S. Ecology. Barnwell and Richland accept Classes A through C of low-level waste, whereas Clive only accepts Class A LLW. The DOE has a few LLW sites under management. The biggest of these exist at DOE Reservations around the nation (for example the Hanford Reservation, Savannah River Site, Nevada Test Site, Los Alamos National Laboratory, Oak Ridge National Laboratory, Idaho National Laboratory, to name the most important).
Classes of wastes are detailed in 10 C.F.R. § 61.55 Waste Classification enforced by the Nuclear Regulatory Commission, reproduced in the table below. These are not all the isotopes disposed of at these facilities, just the ones that are of most concern for the long term monitoring of the sites. Waste is spling into three classes, A through C, where A is the least radioactive and C is the most radioactive. Class A LLW is able to be deposited close to the surface, whereas Classes B and C LLW have to be buried progressively deeper.
Low-Level Waste (LLW) is a term used to describe nuclear waste that does not fit into the categorical definitions for high-level waste (HLW), spent nuclear fuel (SNF), transuranic waste (TRU), or certain byproduct materials known as 11e wastes, such as uranium mill tailings. In essence, it is a definition by exclusion, and LLW is that category of radioactive wastes that do not fit into the other categories. If LLW is mixed with hazardous wastes, then it has a special status as Mixed Low-Level Waste (MLLW) and must satisfy treatment, storage, and disposal regulations both as LLW and as hazardous waste. While the bulk of LLW is not highly radioactive, the definition of LLW does not include references to its activity, and some LLW may be quite radioactive, as in the case of radioactive sources used in industry and medicine.
The definition of low level waste is set by the nuclear regulators of individual countries, though the IAEA provides recommendations. Some countries, such as France, specify categories for long-lived low (and intermediate) level waste