---
title: "Under Sink Water Filter — $2.8M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/under-sink-water-filter"
last_updated: "2026-08-08T15:50:10.764Z"
locale: en
meta:
description: "Niche score 43/100 · $2.8M/yr market · 986K searches/yr · $109.75 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 43/100 · $2.8M/yr market · 986K searches/yr · $109.75 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Under Sink Water Filter — $2.8M/yr Amazon US Niche (2026) - Flapen"
---
# **under sink water filter**
**Skip it**
Brand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.
Market size 96Growth 38Conversion 33Competition 37Returns 25Price range 17Avg price 72Brand share 11Review moat 24Quality gap 45
**Market size**
**Incredible****$2.8M**
$2.8M/yr · 986K searches
**Avg price**
**Good****$109.75**
avg listing price — sweet spot $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Okay****+10.5%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****63%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Okay****2.6%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Bad****5.1%**
return rate — above 5% kills the launch gate
**Review moat**
**Bad****5,288.72**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Bad****$34.84–$422.62**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Bad****96%**
top-5 brand share — brand-locked demand
**Signals**[** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, under sink water filter is a $2.8M/yr Amazon United States market (986K searches/yr). The top 5 brands hold 96% of demand. Verdict: Skip it — 43/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **under sink water filter market data**
- **Units sold / yr**
- **20K–25K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **$2.2M–$2.7M**
- units × avg price
- **Conversion rate**
- **2.6%**
- **Avg BSR**
- **#34**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **65 months**
- **Avg seller age**
- **148 days**
## **Competition & brand share**
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**8 **▼falling
**Sellers**
**15**
**Top-5 brand share**
**96%**
Top 20: 100%
**Top-5 click share**
**63%**
Top 20: 100%
**Open market**
**3%**
- Waterdrop74% - iSpring8% - ICEPURE7% - CuZn5% - Amazon Basics2% - PUREPLUS2% - Open — no brand owns it (2 brands, 3%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +10.5% search growth over the last 90 days.
40K30KSpike '24Holiday '24Prime Day '25Spike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/under-sink-water-filter/trend)
## **Top under sink water filter search terms**
- **under sink water filter**410K/yr-1.0%2.0% conv. - **under sink water filter system**91K/yr+173.0%1.6% conv. - **undersink water filter systems**79K/yr-1.8%1.7% conv. - **under sink water filtration system**107K/yr-38.3%1.5% conv. - **water filter under sink**61K/yr+11.8%1.9% conv. - **under sink filter**34K/yr+6.2%2.0% conv. - **under the sink water filter system**28K/yr-0.4%1.5% conv. - **under the sink water filter**23K/yr+13.8%1.7% conv. - **undersink water filter**20K/yr+27.1%1.8% conv. - **hydroviv under sink water filter**14K/yr+53.3%0.9% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/under-sink-water-filter/search-terms)
## **Top under sink water filter products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$285K20%$569K30%$854K40%$1.1M101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Waterdrop 10UA Under Sink Water Filter System NSF/ANSI 42 Certified 1 Year**Waterdrop**$42.05**4.6★13,883 rev](https://www.amazon.com/dp/B083NPW1DN) [2**Waterdrop TSA 8 Layer Under Sink Water Filter System NSF/ANSI 42 Certified**Waterdrop**$97.39**4.5★2,475 rev](https://www.amazon.com/dp/B08P58F9SG) [3**Waterdrop 15UA Under Sink Water Filter System 19000 Gallons 2 Years**Waterdrop**$54.61**4.5★8,568 rev](https://www.amazon.com/dp/B083NR5DVY) [4**Waterdrop TSU 0.01 Micron Ultra Filtration Under Sink Water Filter System**Waterdrop**$136.71**4.5★3,390 rev](https://www.amazon.com/dp/B086YH42QP) [5**iSpring RCC7AK-BN NSF Certified 75 GPD Alkaline 6-Stage Reverse Osmosis System pH+ Remineralization RO Water Filter System Under Sink Patented Top-Mounted Faucet Design for Easy Installation**iSpring**$209.73**4.6★15,066 rev](https://www.amazon.com/dp/B005LJ8EXU)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**AQUALTRA USF01-BK Under Sink Water Filter System 12K Gal NSF/ANSI/CAN 372 Certified Reduces PFOA PFOS Chlorine Lead Mercury Chloramine Fluoride Microplastics Particles Bad Taste & Odor**AQUALTRA**$39.41**46 rev4mo ago](https://www.amazon.com/dp/B0GBTDFPQT) [**Amazon Basics Under Sink Water Filter System NSF/ANSI 42 & 372 Certified Easy Twist-and-Lock Design 11 000 Gallons 1 Year Service Life White**Amazon Basics**$34.84**180 rev11mo ago](https://www.amazon.com/dp/B0DPYTFBWL) [**Waterdrop UL12A Under Sink Water Filter Upgraded for 10UA Time Reminder**Waterdrop**$50.04**13,883 rev1y ago](https://www.amazon.com/dp/B0DLGPZN8Y) [**Waterdrop WD-TSA-UF 0.01 m Ultra Filtration Under Sink Water Filter System**Waterdrop**$116.40**1,447 rev2y ago](https://www.amazon.com/dp/B0D1R9RS3S) [**Waterdrop UA-5Y 5-Year Under Sink Water Filter System Ultra Long Life**Waterdrop**$97.66**8,568 rev2y ago](https://www.amazon.com/dp/B0D4547V44)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**AQUALTRA USF01-BK Under Sink Water Filter System 12K Gal NSF/ANSI/CAN 372 Certified Reduces PFOA PFOS Chlorine Lead Mercury Chloramine Fluoride Microplastics Particles Bad Taste & Odor**AQUALTRA**$39.41**4.3★**▲ 266%**](https://www.amazon.com/dp/B0GBTDFPQT) [**Aquasana Water Filter for Sink Faucet | Reduces 99% of 78 Contaminants Including Chlorine & Lead from Tap Water | Under Sink Filtration | Claryum Direct Connect | AQ-MF-1**Aquasana**$119.47**3.8★**▲ 65%**](https://www.amazon.com/dp/B088GSC89B) [**Waterdrop UA-5Y 5-Year Under Sink Water Filter System Ultra Long Life**Waterdrop**$97.66**4.5★**▲ 57%**](https://www.amazon.com/dp/B0D4547V44) [**Waterdrop 10UA Under Sink Water Filter System NSF/ANSI 42 Certified 1 Year**Waterdrop**$42.05**4.6★**▲ 21%**](https://www.amazon.com/dp/B083NPW1DN) [**Waterdrop TSA 8 Layer Under Sink Water Filter System NSF/ANSI 42 Certified**Waterdrop**$97.39**4.5★**▲ 18%**](https://www.amazon.com/dp/B08P58F9SG)
**~~View all trending →~~**
## **What buyers say about under sink water filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Assembly/Installation**28%
*“Easy assembly”*
**Filtration**17%
*“Excellent Filter”*
**Quality-Overall**11%
*“The build quality feels solid”*
**Value For Money**6%
*“Great Value”*
**Ease Of Use**3%
*“makes it easy to remove”*
**Ease Of Cleaning**2%
*“is easy to clean”*
**Instructions/User Manual/Troubleshooting**2%
*“Easy to follow instructions”*
**Water Flow**2%
*“The water flow is great”*
**Advertised Vs Actual Product**2%
*“As Advertised”*
**Efficiency**2%
*“Works great and clears the water”*
### **What buyers complain about **
**Leak-Proof**18%
*“Leaking”*
**Filtration**14%
*“Doesn't filter well”*
**Assembly/Installation**8%
*“This is not an easy install”*
**Value For Money**3%
*“Did not purchase too expensive”*
**Quality-Overall**3%
*“the quality control needs improvement”*
**Durability**2%
*“Stopped working after a week”*
**Noise Level**2%
*“Very Noisy”*
**Smell**2%
*“smells like a dead animal”*
**Size-Overall**2%
*“Short by an entire inch”*
**Water Resistance**2%
*“The water is dripping from underneath the machine itself”*
### **Top return reasons **
**Size-Overall**31%
**Filtration**15%
**Compatibility-Overall**9%
**Assembly/Installation**9%
**Value For Money**7%
**Leak-Proof**6%
**Advertised Vs Actual Product**4%
**Functionality-Overall**4%
**Connectivity-Overall**3%
**Defective Material/Parts**3%
## **Common questions**
- **Is under sink water filter profitable to sell on Amazon United States?**
- The niche generates $2.8M/yr across 18 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +10.5%. Flapen's verdict: Skip it (43/100).
- **How competitive is the under sink water filter niche?**
- 8 brands and 15 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 96% of demand.
- **What do buyers complain about in under sink water filter?**
- Top complaints mined from reviews: Leak-Proof, Filtration, Assembly/Installation. The return rate is 5.1% — above our launch gate.
- **When does demand for under sink water filter peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the under sink water filter niche?**
- Listings span $34.84–$422.62; the average listing price is $109.75 (sweet spot $15–$100). The average incumbent carries 5,289 reviews — the moat a new listing must climb.
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