San Ramon, California
Dublin San Ramon Services District 2025 Consumer Confidence Report (Water Boards). San Ramon drinking water on this file is Dublin San Ramon Services District, PWS CA0110009. EBMUD also serves some San Ramon Valley addresses — check the bill. Hardness as CaCO3 **88 mg/L** (56–152) and **318 mg/L** (35–452). Chloramines RAA **2.14 mg/L**. No Measure S-style residential softener ban turned up — check the sewer agency on the bill.
- Hardness (column 1)88 mg/L (56–152)
- Hardness (column 2)318 mg/L (35–452)
- Chloramines2.14 mg/L RAA
Best match for San Ramon
Salt-based water softener — confirm the district first
Check the sanitation district before installing a salt system.
Ask the agency on the sewer side of the bill before you cut a brine drain. California lets districts restrict self-regenerating units. A “banned in California” blog is not your district.
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Other options that still fit
Salt-free conditioner
A salt-free conditioner changes how scale sticks. It does not soften. Soap and spots stay closer to untreated. No brine line.
Whole-house catalytic carbon for chloramine
Catalytic carbon with a chloramine claim (NSF/ANSI 42 for chloramine). Regular chlorine carbon is the wrong box.
Under-sink reverse osmosis
The under-sink RO we actually run is Cloud RO — NSF/ANSI 58, kitchen tap, not a whole-house tank. Check the exact listing if PFAS is why you are shopping. Shop Amazon first for under-sink RO, or buy Cloud direct. Waterdrop is a tankless option if you want that path. A certifier-listed pitcher is the cheap first step. Nobody is paying for a medical claim.
Shop under-sink reverse osmosisBuy Cloud RO directShop Waterdrop reverse osmosisShop PFAS-listed pitchers
Test the tap first
A homeowner kit is a start. It is not a state-certified lab. Use a certified lab when the decision is expensive.
On the report
- Water utility
- Dublin San Ramon Services District
- Hardness
- Same DSRSD 2025 CCR as the Dublin file. Total hardness as calcium carbonate 88 mg/L (56–152) and 318 mg/L (35–452). EBMUD pockets exist in the San Ramon Valley — check the bill. — Dublin San Ramon Services District 2025 Consumer Confidence Report
- Disinfectant
- Chloramines as chlorine, systemwide RAA 2.14 mg/L, MRDL 4.0, 2025. — Dublin San Ramon Services District 2025 Consumer Confidence Report
- Brine / salt to the sewer
- Check the sanitation district before installing. No city or sanitation-district residential self-regenerating softener ban like LACSD Measure S or IEUA Ordinance § 2.6 turned up on the pages we opened. That is not a statewide ban finding. Ask the agency on the sewer bill before you cut a brine drain.
Also around here
Extra context besides the utility report and the chart above — geology, an unregulated table, or a published study. Not a second set of printed tap numbers.
- MicroplasticsWHO’s 2019 review examined studies that found microplastic particles in treated tap and bottled water in many places. That is a published-occurrence finding, not a number from this city’s water-quality report, and we do not invent a particles-per-liter count for the tap.Microplastics in drinking-water — World Health Organization
- PFASEPA’s Fifth Unregulated Contaminant Monitoring Rule required community systems this size to test 29 PFAS and lithium in 2023–2025. Open the UCMR 5 Data Finder for this PWS. This file does not invent a detection.Fifth Unregulated Contaminant Monitoring Rule — U.S. Environmental Protection Agency
San Ramon drinking water on this file is Dublin San Ramon Services District, PWS CA0110009. No city or sanitation-district residential self-regenerating softener ban like LACSD Measure S or IEUA Ordinance § 2.6 turned up on the pages we opened. That is not a statewide ban finding. Ask the agency on the sewer bill before you cut a brine drain. This is not a legal opinion.
San Ramon drinking water on this file is Dublin San Ramon Services District, PWS CA0110009. EBMUD also serves some San Ramon Valley addresses — check the bill. Hardness as CaCO3 88 mg/L (56–152) and 318 mg/L (35–452). Chloramines RAA 2.14 mg/L. Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.
Sources
- 2025 Consumer Confidence Report (PWS CA0110009) — Dublin San Ramon Services District / State Water Resources Control Board. Accessed 2026-09-11.
Updated September 11, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.