No district prohibition found in current research. No Austin Water sewer prohibition comparable to LACSD Measure S turned up. Confirm with Austin Water wastewater before you cut a brine drain.
Hardness (as published)
2025 CCR page: total hardness as CaCO3 70–126 ppm (4.1–7.4 gpg), average 93 ppm / 5.4 gpg. — Austin Water 2025 Consumer Confidence Report (austintexas.gov water quality reports)
Disinfectant (as published)
Chloramines. 2025 table: 0.06–3.1 ppm, average 2.3 ppm (MRDL 4). — Austin Water 2025 Consumer Confidence Report
What actually fits
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If soap will not lather and the glassware looks chalky
Salt-based softener: two mineral tanks and a brine tank.
A salt-based softener is the thing that actually removes hardness. Size it from your grains and how much water you use, not bathroom count. It needs a drain.
If you are shopping a PFAS listing for the kitchen
Under-sink reverse osmosis: filters, tank, and a second faucet.
A pitcher or under-sink RO whose exact model is listed for PFAS under NSF/ANSI 53 or 58. The RO shop link is Waterdrop. Pitchers stay on a tagged Amazon search. We have not picked a model.