Two eras of pipe, one town
Older Littleton neighborhoods around downtown and the Bemis area still run original clay lateral, which fails at the joints. Post-1985 subdivisions run plastic, which fails from what goes down it. Assuming the wrong one wastes a service call.
How we tell in ten minutes
The cleanout fitting, the sound the cable makes and the first thirty feet of camera footage identify the material and era before we commit to a method.

