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The Libertad sample also registered a total hardness of 407.5 mg/L CaCO3 as compared to the 300 mg/L PNSDW limit.
While all other water samples were within the permissible limit, the recorded 643.2 mg/L TDS value for the Initao sample and 578.4 mg/L for Gitagum were beyond the limits set by PNSDW and USEPA.
All total hardness data of water samples from all locations have values that are within the PNSDW standard limit of 300 mg/L CaCO3, except for Libertad.
Overall, these results may indicate potential levels of ions [2,13,21] The TDS result was in agreement with the conductivity result which was site specific in terms of variation (p value = 0.010381; refer to Table 6), exceeding PNSDW drinking water standard (refer to Figure 6) .
In the letter that we sent to our affected customers, we clearly stated that except for the discoloration, our water supply is still within the parameters set by the PNSDW, Rufo said.
In the letter that we sent to our affected customers, we clearly stated that except for the discoloration,our water supply is still within the parameters set by the Philippine National Standards for Drinking Water (PNSDW).
Note that under the PNSDW, manganese is classified not under Inorganic Chemicals with Health Significance but under Physical and Chemical Quality for
Under the PNSDW, the permissible level of manganese in drinking water is 0.4 mg/L.
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- PNS (disambiguation)