San Martin Tap Water Quality Report
San Martin's water record shows 5 contaminants with an EPA health goal detected in some samples (no level on file) and 1 nitrate reading above 10 mg/L whose basis is unconfirmed (above EPA's limit if measured as nitrogen, within it if measured as nitrate). Consider using a certified water filter for additional protection.
Other systems listed for San Martin with results above guidelines: SANTA CLARA VALLEY WATER DISTRICT (2 above guidelines)
Water system
WEST SAN MARTIN WATER WORKS INC
2 other systems are listed for San Martin. See their figures
People Served
1,173
Health-based violations since 2020
0
WEST SAN MARTIN WATER WORKS INC. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Sep 2022 · WEST SAN MARTIN WATER WORKS INC
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is San Martin 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. San Martin's water record shows 5 contaminants with an EPA health goal detected in some samples (no level on file) and 1 nitrate reading above 10 mg/L whose basis is unconfirmed (above EPA's limit if measured as nitrogen, within it if measured as nitrate).
WEST SAN MARTIN WATER WORKS INC, San Martin's water system, serves 1,173 people. 2 other systems are listed for San Martin. Each system's results are listed under its own name, never added to WEST SAN MARTIN WATER WORKS INC's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for WEST SAN MARTIN WATER WORKS INC is from Sep 2022.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in California
San Martin Water Service Areas
What these numbers actually mean for San Martin, CA
We read San Martin, 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.
- 5 contaminants with an EPA health goal detected in some samples (no level on file) and 1 nitrate reading above 10 mg/L whose basis is unconfirmed (above EPA's limit if measured as nitrogen, within it if measured as nitrate)
- 14 results on file
- No PFAS results on record
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General-Purpose Water Filters for San Martin
San Martin'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 San Martin's water readings can explain
We publish a city-level hardness figure for San Martin, 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 San Martin? Public-water results do not apply to private wells. See Santa Clara County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in San Martin
San Martin's tap water has an estimated 12.3 grains per gallon (210.0 mg/L, county sampling in Santa Clara County) — very hard on the USGS scale, the range where scale on fixtures and appliances is the usual complaint.
Water softener cost for an estimated 12.3 gpg water in San Martin — 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 San Martin Tap Water
San Martin's water record shows 5 contaminants with an EPA health goal detected in some samples (no level on file) and 1 nitrate reading above 10 mg/L whose basis is unconfirmed (above EPA's limit if measured as nitrogen, within it if measured as nitrate). 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 WEST SAN MARTIN WATER WORKS INC. For a problem with your water now (discolored water, no water, low pressure, a leak), contact WEST SAN MARTIN WATER WORKS INC directly.
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