Sammamish Tap Water Quality Report
Sammamish's water has 4 contaminants above EPA MCLGs. We recommend using a certified water filter.
Other systems listed for Sammamish with results above guidelines: NE SAMMAMISH SEWER & WATER DISTRICT (1 above guidelines)
People Served
65,856
Health-based violations since 2020
0
SAMMAMISH PLATEAU WATER & SEWER. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Aug 2025 · SAMMAMISH PLATEAU WATER & SEWER
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Sammamish Tap Water Safe to Drink?
We strongly recommend using a certified water filter to reduce exposure: Sammamish's water has 4 contaminants above EPA health-based guidelines. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Sammamish's water.
SAMMAMISH PLATEAU WATER & SEWER, Sammamish's water system, serves 65,856 people. 1 other system is listed for Sammamish. Each system's results are listed under its own name, never added to SAMMAMISH PLATEAU WATER & SEWER's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for SAMMAMISH PLATEAU WATER & SEWER is from Aug 2025.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Washington
Sammamish Water Service Areas
What these numbers actually mean for Sammamish, WA
We read Sammamish, WA’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 above EPA MCLGs and 3 contaminants with an EPA health goal detected in some samples (no level on file)
- 189 results on file
- 23 PFAS compounds on record
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Recommended Water Filters for Sammamish
Based on Sammamish's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
AquaTru
Classic
NSF Certified:
Flow Rate
0.04 gpm
Daily Production
600 gpd
Highlights:
- Best overall contaminant reduction score
- Most performance certifications
- Lifetime warranty
- NSF-42, NSF-53, NSF-58, NSF-401 certified
Removes 23 contaminants:
+18 more
Molybdenum, Barium, Chlorine, Arsenic, 83+ contaminants, Calcium, Chloride, Copper, Magnesium, Nitrate, Phosphorus, Sodium, Sulfate, Total Dissolved Solids, Zinc, Total THMs, Chloroform, Nitrate (as N)
AquaTru
Carafe
NSF Certified:
Flow Rate
0.3 gpm
Daily Production
4 gpd
Highlights:
- Verified PFAS reduction
- Glass collection vessel
- Plug-and-play installation
- NSF-53, NSF-42, NSF-58, NSF-401, NSF-372 certified
Removes 17 contaminants:
+12 more
Arsenic, 83+ contaminants, Copper, Total THMs, Chloroform, Chloride, Sulfate, Nitrate (as N), Molybdenum, Barium, Strontium, Uranium
Waterdrop
G3 P600
NSF Certified:
Flow Rate
600 gpm
Daily Production
600 gpd
Highlights:
- Space-saving design
- Good contaminant reduction
- NSF-58 certified
Removes 4 contaminants:
Waterdrop
G3 P800
NSF Certified:
Flow Rate
800 gpm
Daily Production
800 gpd
Highlights:
- High water production rate
- Modern design
- No tank needed
- NSF-42, NSF-53, NSF-58, NSF-372 certified
Removes 15 contaminants:
+10 more
Chlorine, Copper, Manganese, Potassium, Selenium, Total Dissolved Solids, Nitrate, Chloride, Sodium, Strontium
Filters for what Sammamish reported
Verify Your Water Quality with Independent Testing
With 4 contaminants above EPA MCLGs and 3 contaminants with an EPA health goal detected in some samples (no level on file), independent laboratory testing provides a second opinion and can track changes over time.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
PFAS Forever Chemicals Test
$339.95
Specialized test for PFOA, PFOS, and 24 other forever chemicals. Essential for areas near military bases, airports, or industrial sites.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
With 4 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Sammamish's water readings can explain
Utility-reported data for Sammamish includes turbidity and a chlorine-based disinfectant — the readings behind these common tap water questions. We publish a city-level hardness figure for Sammamish, 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 Sammamish? Public-water results do not apply to private wells. See King County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Sammamish
Sammamish's tap water measures 3.7 grains per gallon (62.6 mg/L) — moderately hard on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for 3.7 gpg water in Sammamish — 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 Washington as a whole, read water softener cost in Washington — priced against the plumber wage published for the state.
Frequently Asked Questions About Sammamish Tap Water
Sammamish's water has 4 contaminants above EPA MCLGs. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Sammamish's water.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach SAMMAMISH PLATEAU WATER & SEWER. For a problem with your water now (discolored water, no water, low pressure, a leak), contact SAMMAMISH PLATEAU WATER & SEWER directly.
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