Redwood City Tap Water Quality Report
Redwood City's water record shows 4 contaminants with an EPA health goal detected in some samples (no level on file). Consider using a certified water filter for additional protection.
People Served
89,037
Health-based violations since 2020
0
CITY OF REDWOOD CITY. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Oct 2025 · CITY OF REDWOOD CITY
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Redwood City Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Redwood City's water record shows 4 contaminants with an EPA health goal detected in some samples (no level on file).
CITY OF REDWOOD CITY, Redwood City's water system, serves 89,037 people. 1 other system is listed for Redwood City. Each system's results are listed under its own name, never added to CITY OF REDWOOD CITY's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for CITY OF REDWOOD CITY is from Oct 2025.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in California
Redwood City Water Service Areas
What these numbers actually mean for Redwood City, CA
We read Redwood City, CA’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 4 contaminants with an EPA health goal detected in some samples (no level on file)
- 34 results on file
- 23 PFAS compounds on record
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General-Purpose Water Filters for Redwood City
Redwood City's results show no result above EPA's health goals or legal limits, so these are general-purpose NSF/ANSI 53 certified filters, not chosen for any contaminant.
Pentair Residential Filtration, LLC
Everpure Residential H-300-NXT
NSF Certified:
Capacity
3001 gal
Filter Life
10 mo
Flow Rate
0.5 gpm
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Whirlpool Corporation
W11569861
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.52 gpm
Removes 22 contaminants:
+17 more
Atrazine, Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Styrene, Tetrachloroethylene, Toxaphene, Trichloroethylene, Turbidity
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Test Your Water Quality
Professional laboratory testing provides accurate, detailed analysis of your drinking water.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
What Redwood City's water readings can explain
Utility-reported data for Redwood City includes a chlorine-based disinfectant — the readings behind these common tap water questions. We publish a city-level hardness figure for Redwood City, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Redwood City? Public-water results do not apply to private wells. See San Mateo County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Redwood City
Redwood City's tap water measures 1.9 grains per gallon (32.2 mg/L) — soft on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for 1.9 gpg water in Redwood City — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For California as a whole, read water softener cost in California — priced against the plumber wage published for the state.
Frequently Asked Questions About Redwood City Tap Water
Redwood City's water record shows 4 contaminants with an EPA health goal detected in some samples (no level on file). We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach CITY OF REDWOOD CITY. For a problem with your water now (discolored water, no water, low pressure, a leak), contact CITY OF REDWOOD CITY directly.
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