Rate Matters	3 Months Ended
Mar. 31, 2021
Rate Matters [Abstract]
Rate Matters	9. Rate Matters From time to time, the Company files applications for rate increases with the PPUC and is granted rate relief as a result of such requests. Most recently, the PPUC authorized an increase in rates effective March 1, 2019. The PPUC permits water utilities to collect a distribution system improvement charge, or DSIC. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing. This surcharge mechanism typically adjusts periodically based on additional qualified capital expenditures completed or anticipated in a future period. The DSIC is capped at 5% of base rates, and is reset to zero when new base rates that reflect the costs of those additions become effective or when a utility's earnings exceed a regulatory benchmark. The DSIC reset to zero when the new base rates took effect March 1, 2019. Since the reset, the Company's earnings have exceeded the regulatory benchmark, preventing the collection of a DSIC. There were no DSIC revenues for the three months ended March 31, 2021 and 2020.

9. Rate Matters

From time to time, the Company files applications for rate increases with the PPUC and is granted rate relief as a result of such requests. Most recently, the PPUC authorized an increase in rates effective March 1, 2019.

The PPUC permits water utilities to collect a distribution system improvement charge, or DSIC. The DSIC allows the Company to add a charge to customers' bills for qualified replacement costs of certain infrastructure without submitting a rate filing. This surcharge mechanism typically adjusts periodically based on additional qualified capital expenditures completed or anticipated in a future period. The DSIC is capped at 5% of base rates, and is reset to zero when new base rates that reflect the costs of those additions become effective or when a utility's earnings exceed a regulatory benchmark. The DSIC reset to zero when the new base rates took effect March 1, 2019. Since the reset, the Company's earnings have exceeded the regulatory benchmark, preventing the collection of a DSIC. There were no DSIC revenues for the three months ended March 31, 2021 and 2020.