Source of natural water is groundwater from reservoirs:
- zajetje nad rezervoarjem,
- zajetje pod skalo,
- zajetje ob cesti.
Water system supplies drinking water for the inhabitants of one part of the settlement Kupljenik.
Informations on water system Kupljenik
| Quality monitoring | comply with applicable law |
| Water treatment | Yes, clorination |
| Spreading rate of water resources | 0,9 l/s (0,05–0,7) |
| Water hardness | 7,8 °dH (soft) |
| Water temperature at source | 8,2–12,6 °C |
| pH-value | 8,1 |
| The electrical conductivity at 20 °C (dissolved salt in the water) | 233 |
| Number of residents | approx. 50 |
| Pumping station | 0 |
| Dischargers | 0 |
| Water storage | 1 |
| The average consumption of water per year | 1.750 m3 |
| Total lenght of water system | approx. 1.000 m |
| Material of water pypes | PE |
| Number of hydrants | 3 |
| Number of households water connections | approx. 10 |
