OP has 80 ppm and 50 ppm hardness, most likely most of which is calcium. Assuming his pH is really closer to 5.5 that is consistent with about 0.3 atm subterranean CO2. As to bierandbikes, I don't know his water chemistry but he lives only 60 mi. from the famous (limestone) Luray Caverns and water all over the state is moderately hard so I really think it is probably bacterial CO2/limestone that explains his low pH. Given where he lives I expect his water is somewhat similar to mine i.e. possessed of appreciable alkalinity which atmospheric CO2 can't provide. Atmospheric CO2 will bring deionized water to pH 5.67 but only introduces alkalinity of 2.5. Whether buffered by limestone or not subterranean CO2 still lowers pH. The 0.3 atmosphere number I threw out above, not that it is valid in either of these gentlemens' cases, would cause distilled water to come to pH 4.2.
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