For the treatment of source-separated excreta, the largest median costs were attributed to transport (34% [21 -46%]) due to the high frequency of container collection and transport to the OP (every 1 -9 d with triangular distribution, mode of 3.5). The second greatest costs were the operation and maintenance expenses from the treatment of the liquid stream (23% [14 -33%]). The liquid treatment included the units for recovery of struvite via precipitation and ammonium sulfate via ion exchange, both of which require consumables. The next highest contributors to costs for this scenario were the urine-diverting dry toilets' capital (17% [10 -36%]) and operation and maintenance (10% [5 -21%]). The other notable costs were for operators (8% [5 -12%]) and operating and maintenance costs of the carbonizer base (2% [1 -3%]). Since excreta is separated at the source and processed independently, only a grinder is required for pretreatment, which has significantly lower energy requirements compared to the dewatering pretreatment necessary in the mixed excreta scenario. The construction emissions (i.e., capital) of the urine-diverting dry toilets were the most significant contributor to GHG emissions for this scenario (55% [38 -80%]) due to the large number of bricks that are required to house the containers of the urine-diverting dry toilets. The proceeding contributors to GHG emissions were the operation and maintenance of the liquid treatment (23% [10 -35%]), energy for pretreatment (7% [3 -15%]), and transportation emissions (5% [1 -15%]). The remaining contributors to GHG emissions from the treatment of source-separated excreta were relatively small (< 1% on average).