Observed arrival · 2026-10-19
WaterProfile Local: hardness by utility
A database of US water utilities’ reported hardness figures, with report dates, unit conversions, and USGS hardness classifications.
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- US residents checking their utility’s water hardness
- Worth noticing
- It distinguishes reported averages, maximums, and system-wide ranges, and labels its chart bands as equal-width rather than linear.
Field notes
The homepage says each utility entry includes the source wording, report year, and conversion, helping distinguish a system average from a maximum or a range. Its unit notes cover mg/L, ppm, and occasionally ppb, while the softener-oriented grains-per-gallon value is converted at 17.1 mg/L per grain when not supplied by the utility. The chart explicitly warns that its classification bands are equal width, not a linear scale.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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