Anderson Island, WA vs Tacoma, WA
Which City Has Better Water Quality?
When comparing tap water quality between Anderson Island, WA and Tacoma, WA, Anderson Island currently holds a narrow 3-point edge in average WaterQ score, with a score of 100 out of 100 versus 97 for Tacoma. Both cities currently carry an A grade overall. A WaterQ score reflects an aggregate of EPA-reported violations, monitoring data, and compliance history across all public water systems serving each city, so a higher score generally indicates fewer recent violations and a stronger compliance record, though it does not guarantee that every tap in the city tests identically.
Tacoma, WA is the larger of the two, with 611,491 more residents than Anderson Island. Tacoma is served by 20 public water systems, compared with 1 in Anderson Island — a difference of 19 systems. A larger number of systems often reflects a more fragmented distribution network spanning multiple utilities, suburbs, or rural service areas, while a single large utility serving a big population can benefit from economies of scale in treatment and monitoring, but may also face more complex, aging infrastructure to maintain.
For residents of either Anderson Island or Tacoma, the most useful next step is to look up the specific water system that serves your address, since city-wide averages combine results from every system in the area. Visit the Anderson Island or Tacoma city pages below for a breakdown of local systems, recent violations, and contaminant-specific data, or browse WaterQ's contaminants directory to learn what each measured substance means for health.
Detailed Comparison
| Metric | Anderson Island | Tacoma |
|---|---|---|
| Water Quality Score | 100 | 97 |
| Grade | A | A |
| Water Systems | 1 | 20 |
| Population | 1,380 | 612,871 |
| County | ||
| State | WA | WA |
Analysis
Water Filtration Recommendations: Anderson Island & Tacoma
Comparing point-of-use protection between Anderson Island and Tacoma. If either water system has recorded disinfectant byproducts (THMs/HAAs), lead line risks, or hard minerals, a certified filter provides reliable household protection.
APEC Water Systems ROES-50 5-Stage Reverse Osmosis System
Removes up to 99% of 1,000+ contaminants including Lead, Chlorine, PFAS, Fluoride, Arsenic, and TDS.
Waterdrop G3P800 Tankless Reverse Osmosis System
800 GPD high capacity, 3:1 pure-to-drain ratio, smart LED faucet displaying real-time TDS and filter life.
Aquasana 3-Stage Under Sink Water Filter System (AQ-5300+)
Reduces 77 contaminants including 99.6% of Lead and PFOA/PFOS while retaining healthy minerals (calcium, magnesium).
Frizzlife Under Sink Water Filter System (MK99)
Directly hooks into cold water line with 0.5-micron precision. Quick-change twist-in filter cartridges.
ZeroWater 5-Stage 22-Cup Ready-Read Filter Dispenser
5-stage ion exchange removes 99.6% of total dissolved solids. Built-in digital TDS meter included.
Clearly Filtered Water Pitcher with Affinity Filtration
Independently tested against 365+ contaminants including PFAS, microplastics, lead, fluoride, and glyphosate.
Brita Elite Water Filter Pitcher (Monterey)
Reduces 99% of Lead and 30+ contaminants. Each Elite filter lasts 6 months (120 gallons) — 3x longer than standard.
AquaBliss High Output Revitalizing Shower Filter
Quickly neutralizes chlorine, heavy metals, pesticides, and scale, preventing dry itchy skin and damaged hair.
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Frequently asked questions
Which city has better tap water quality: Anderson Island or Tacoma?
Anderson Island currently has the higher WaterQ score (100/100). Check each city page for system-level details and recent violations.
How are Anderson Island and Tacoma water scores calculated?
WaterQ scores are based on EPA-reported drinking water data, including contaminant detections, violations, and compliance records across local systems.
Where can I view full reports for Anderson Island and Tacoma?
Use the city detail pages to see water systems, score breakdowns, and trend context for Anderson Island, WA and Tacoma, WA.