Independent · Lab-tested · No paid placement
Every $500–$9,000 water system, scored on the bench, not the back-channel.
HydroAudit is the testing-led review site for homeowners shopping for residential water treatment. Every review pulls from hands-on bench testing, published NSF/ANSI 44 and 58 certification breakdowns, and a transparent 10-year cost-of-ownership model — never from whoever pays the biggest commission cut.
What the mission means in practice
Independent lab data
Every unit bought at retail, installed on the same 1 gpm rig.
Real decade-cost math
10-year cost of ownership, not just sticker price or listicle top-3.
Verified certifications
NSF/ANSI 44, 53, 58 scope cross-checked against the published standard.
41
Systems on the bench
6
NSF standards tracked
10 yr
Cost model horizon
0
Charged-for placements
Methodology
Five-step bench audit, every unit, every time.
No press samples. No priority re-test after complaints. The same five steps run on a $500 under-sink cartridge and a $9,000 salt softener combo.
Procure
We buy every unit at full MSRP from retail channels. No press samples, no manufacturer comped loaners.
Bench
Each system is installed on a 1 gpm test rig, fed the same municipal and well-water reference profiles we publish.
Measure
Hardness, TDS, chlorine, flow-pressure drop, and bypass leakage are logged at hours 0, 24, 168, and 720.
Disclose
We publish the raw data, the test SOP, and every NSF/ANSI 44, 53, 58, 401 claim that the unit is certified to.
Score
A reader-weighted score combines lab performance, 10-year cost, warranty, and post-purchase support — never affiliate commission.
How we make money
No paid ranking placements. The commissions never move you up a list.
HydroAudit is free to read. We earn 10–20% affiliate commissions on brands we already cover — SpringWell, Crystal Quest, US Water Systems, Aquasana, Epic Water Filters, Phoenix Gravity — and every commission is published at the bottom of every review. A manufacturer cannot pay to move position, and we publish the methodology, the weight table, and every source dataset. The site converts modest traffic into serious revenue per click precisely because readers trust the math.
- We buy every unit at full MSRP from retail.
- Manufacturers see our numbers after publication, never before.
- Ranking weight table is public and re-runnable.
- Affiliate links are disclosed per page, in the same place.
Cornerstone reviews
The reviews in flight — bench data, not listicle top-3.
Every cornerstone follows the same five-step audit and publishes the same 10-year cost model. One is live; two are still on the bench. Open the live review, or read the cohort status on the ones we have not finished.
Best water softeners
NSF/ANSI 44
14 salt-based softeners benched end-to-end. Drag the calculator on the cornerstone page to model any unit in the cohort.
Best whole-house water filters
NSF/ANSI 42 / 53
11 whole-house carbon and sediment units lined up against the same 1 gpm rig the softeners ran on.
Best reverse osmosis systems
NSF/ANSI 58
9 point-of-use RO units queued for NSF 58 verification round. Bench data will publish the moment last unit clears.