A storage container includes an input portion for receiving and filtering a source liquid to form an output liquid, a storage portion for storing the filtered liquid, and a base portion disposed below the storage portion including a UV light source for providing transmitted UV light to the filtered liquid, a UV light detector disposed an optical path length away from the UV light source for detecting received UV light through the filtered liquid in response to the transmitted UV light, a processor for determining an absorption or a transmission percentage in response to the transmitted UV light and the received UV light, for determining a safe condition, in response to the absorption or the transmission percentage respectively not exceeding or exceeding predetermined criteria, and one or more indicators for indicating that the liquid is safe for consumption to a user, in response to the safe condition.