Our Review Methodology
How we evaluate, rate, and review residential water systems. Every product goes through our structured 4-phase assessment process.
How Products Are Sourced and Selected
Before any product enters our evaluation pipeline, it passes through a three-step selection process designed to keep our coverage relevant.
Market Scan
We monitor major retailers, manufacturer announcements, industry trade coverage, and reader requests to identify water treatment and atmospheric water products with meaningful market presence.
Selection Criteria
Products must be available to U.S. consumers, have published specifications we can verify, and address a genuine water quality need. We prioritize categories where readers ask the most questions.
Product Acquisition
We do not accept payment for reviews. Affiliate relationships never influence which products we cover or how we score them — products are selected on editorial merit before any affiliate consideration.
The Four Phases of Evaluation
Every product we review goes through this comprehensive evaluation process before we publish our findings.
Performance Verification
We verify claims against NSF/ANSI standards and published manufacturer data. Does a filter claim 99% lead reduction? Is that claim backed by NSF certification or third-party lab results? We check the evidence so you don't have to.
Total Cost of Ownership
Sticker price is only half the story. We calculate the 'Real 5-Year Cost' which includes filter replacements, electricity consumption (based on published wattage and usage estimates), and maintenance supplies.
Usability & Installation
Based on manufacturer specs and third-party certifications, we review published manuals, the listed included components, published noise levels in decibels, and the documented ease of routine maintenance like filter changes.
The Hydrology Score
Our final 1-10 rating is a weighted average based on verified specifications, published test data, usability evaluation, and long-term ownership research.
Where Our Data Comes From
We label the basis for every claim in our reviews. Here's how to read our sourcing.
Manufacturer & Third-Party Data
Contaminant reduction percentages, output volumes, wattage, decibel ratings, and certification claims come from published manufacturer specifications, NSF/ANSI certification listings, and third-party lab reports. We cite these sources and verify certifications against official databases where available.
When a performance claim rests solely on manufacturer data without third-party certification, we say so explicitly in the review.
Our Own Editorial Research
Cost-of-ownership calculations, usability assessments, comparison tables, and the final Hydrology Score are produced by our editorial team. Usability and installation assessments are based on manufacturer specs, published manuals, and third-party certifications.
These judgments are ours alone — no manufacturer or affiliate partner reviews or approves our content before publication.
Who Researches and Writes Our Content
Our content is researched and written by the HU Editorial Team using EPA, NSF/ANSI and CDC guidance and peer-reviewed research.
EPA
Drinking water regulations and guidance
NSF/ANSI
Standards for drinking water treatment products
CDC
Public health guidance
Peer-reviewed research
Published studies, cited on the pages that use them
Certifications We Verify
We check for these industry-standard certifications when evaluating water treatment products.
NSF/ANSI 42
Aesthetic effects (chlorine, taste, odor)
NSF/ANSI 53
Health effects (lead, cysts, VOCs)
NSF/ANSI 58
Reverse osmosis systems
NSF/ANSI 401
Emerging contaminants
How We Calculate Our Rating
Our 1-10 rating isn't subjective—it's a weighted average of four key performance areas. This ensures consistency across all our reviews.
See Our Product ReviewsScore Weighting
See Our Methodology in Action
Browse our latest product reviews to see how we apply this evaluation framework to real products.