On May 7, 10:08*am, "John D99" wrote:
I've got a standard resisdential septic system. It was installed 6 1/2 years
ago, I live outisde of Colorado Springs. The diagram I have for the system
shows one holding tank, with a line going out to the leach field.

My question is, if I dig down to the lids on the holding tank, is it
possible to check the solids level to determine if I need the thing pumped
out?

Have it pumped and checked by someone who knows what they are doing.
Mine only cost $100 to pump, but you can expect to pay more in
Colorado, and a whole lot more if it isn't serviced properly. The
peace of mind will be worth it.