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Reading your water quality report
Every SGV water supplier publishes a yearly Consumer Confidence Report.
Updated · 3 min read
Straight answer
Find your supplier's name on your water bill, open its annual Consumer Confidence Report, and look for the hardness row, the source (wells or imported water) and the range. Those three numbers shape how fast scale builds in your heater, faucets and valves.
What this covers
Who supplies your block
The western San Gabriel Valley is a patchwork of water suppliers. San Gabriel's city FAQ explains that more than one company serves that city alone.
Your bill is the quickest way to know. Federal rules require each community water system to publish a yearly report, as the EPA explains.
The rows that matter for plumbing
Most of the report is about health standards. For plumbing, look at these:
- Hardness (as CaCO3), in ppm or mg/L
- Total dissolved solids, a broader mineral measure
- Source, groundwater wells or imported water
- Range, which shows how much your tap can vary
How nearby suppliers compare
Those figures come from San Gabriel County Water District, Monterey Park and Alhambra.
Turning the number into decisions
Under the USGS scale, 61 to 120 mg/L is moderately hard and over 180 is very hard. Very hard water calls for more frequent water heater flushing and makes a softener worth considering.
FAQs
Why does my test strip differ from the report?
Reports give averages across wells and seasons. Your tap reflects the blend you get that week.
Is hard water a health concern?
The USGS describes hardness as mainly an issue of scale and soap use, not health.
Where do I find a report for a mutual water company?
Small suppliers publish one too. Search the company name plus "Consumer Confidence Report" or ask them for it.