Table 1.

Geographic and demographic data related to each wastewater treatment plant included in the study

Site	Location	Served population	County’s population	County’s surface area (km2)	Surrounding counties	Accumulated precipitation (mm)		Average temperature (°C)
						Dry season	Wet season	Dry season	Wet season
WWTP1	Moravia: 9.97142, −84.05216	631	59,705	28.62	Goicoechea, Montes de Oca, San Isidro, San José, San Pablo Santo Domingo, Tibás, and Vásquez de Coronado	67.4	1,762.2	20.3	21.5
WWTP2	Moravia: 9.97864, −84.04641	133	59,705	28.62	Goicoechea, Montes de Oca, San Isidro, San José, San Pablo Santo Domingo, Tibás, and Vásquez de Coronado	67.4	1,762.2	20.3	21.5
WWTP3	San Pablo: 9.98747, −84.10248	705	29,590	7.53	Barva, Heredia, San Isidro, San José, San Rafael, Santo Domingo, and Tibás	131.1	1,035.6	23.9	23.8
WWTP4	Alajuela: 9.93878, −84.28427	678	281,014	388.43	Mora and Santa Ana	139.5	1,720.3	24.1	23.3
WWTP5	Mora: 9.91856, −84.24471	815	28,384	162.04	Alajuela and Santa Ana	294.9	1,961.6	24	23.3
SSZ	-	2,962	1,511,865	628.14	Alajuela, Goicoechea, Montes de Oca, Mora Moravia San Isidro, San José, San Pablo, Santa Ana, Santo Domingo, Tibás, and Vásquez de Coronado	290.9	1,239.4	21.7	21.4

^*Average precipitation for Costa Rican Central Valley is 416 mm for the dry season and 2,169 mm for the wet season.³⁶