Mae Adran 101A yn cynnwys darpariaeth am y ddyletswydd ar ymgymerwyr carthffosiaeth i ddarparu carthffos gyhoeddus at ddibenion carthffosiaeth ddomestig lle y caiff yr amodau a ragnodir gan adran 101A (2) eu bodloni.  Mae gan rai cartrefi yng Nghymru a Lloegr systemau preifat ar gyfer trin carthffosiaeth nad ydynt wedi'u cysylltu â charthffos gyhoeddus.  Gall perchenogion neu feddianwyr cartrefi sydd â systemau preifat ar gyfer trin carthffosiaeth nad ydynt wedi'u cysylltu â charthffos gyhoeddus gyflwyno cais i'r ymgymerwr carthffosiaeth trwyddedig ar gyfer yr ardal i gysylltu'r system â charthffos gyhoeddus o dan yr amodau a ragnodir gan adran 101A o'r Ddeddf.
Section 101A makes provision about the duty on sewerage undertakers to provide a public sewer for domestic sewerage purposes where the conditions prescribed by section 101A(2) are satisfied.  There are properties in England and Wales that are served by private sewerage treatment systems that are not connected to a public sewer.  Owners or occupiers of properties served by private sewerage treatment systems that are not connected to a public sewer, may apply to the licensed sewerage  undertaker for the area where the premises is located for connection to a public sewer under the conditions prescribed by section 101A of the Act.