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# QMP: 30+ years manufacturing water filtration systems in the USA. Trusted by Home Depot, GE & Culligan. Request product details today.

## Sitemaps
[XML Sitemap](https://qmpusa.com/sitemap_index.xml): Includes all crawlable and indexable pages.

## Posts
- [What an NSF Certified Water Filter Actually Proves (and What It Doesn’t)](https://qmpusa.com/blog/nsf-certified-water-filter/): So when someone chooses a filter mostly because the box says 'certified,' I understand the thought process, and I also know how often it points people the wrong way. An NSF certified water filter proves something specific, and the gap between what it covers and what shoppers assume it covers is where most regrettable purchases happen.
- [Are Cheap Water Filters Safe? 5 Risks Every Homeowner Should Know](https://qmpusa.com/blog/are-cheap-water-filters-safe/): So are cheap water filters safe for daily use at home? For taste and odor problems, the answer is yes. For the contaminants behind most long-term health concerns, the answer is no. Lead from aging pipes, PFAS chemicals, arsenic, and pharmaceutical traces are what regulators are racing to address, and a $20 pitcher isn't built to touch any of them. PFAS alone now affects roughly 176 million Americans according to Environmental Working Group data, and the EPA's compliance deadline for public water systems doesn't arrive until 2031.
- [Common Problems With Under Sink RO Systems (2026 Diagnostic Guide)](https://qmpusa.com/blog/common-problems-with-under-sink-ro-systems-2026/): An under-sink RO system quietly works in the background, giving you clean drinking water without causing any trouble. Many homeowners explore different residential reverse osmosis system options before choosing the right setup. But even good systems can run into issues such as slow flow, constant drain noise, a tank that refuses to fill or worse, water on the cabinet floor.
- [What Are Water Filters Made Of? A Look at Every Material Inside Your System](https://qmpusa.com/blog/what-are-water-filters-made-of/): Here is one thing people forget when they ask what are water filters made of. The filtration media is only part of the picture. Your water also runs through the housing, tubing, fittings, and storage tank.
- [American Made Water Filtration Systems: What Homeowners Need to Know in 2026](https://qmpusa.com/blog/american-made-water-filtration-systems/): Each American made water filtration system in the ALKA line was designed around a different household need, so the right choice depends on your space and how much water your family goes through on a daily basis.
- [What Is A Water Filter Housing And How It Works](https://qmpusa.com/blog/what-is-a-water-filter-housing-and-how-it-works/): Most people only notice a water filter housing when something goes wrong. A leak under the sink. A cracked canister. A filter that never quite fits right. That outer shell holding the filter often gets overlooked, yet it plays a critical structural role in system performance.

## Pages
- [Blog](https://qmpusa.com/blog/)
- [QMP OEM](https://qmpusa.com/qmp-oem/): https://qmpusa.com/wp-content/uploads/2026/05/YTDown_YouTube_Profile-Series-Innovators-in-Water-Filtr_Media_59ZiibsN_0c_001_1080p.mp4
- [Contact Us](https://qmpusa.com/contact-us/): (661) 294-6860
- [Our Products](https://qmpusa.com/our-products/): Home Cartridges Commercial Countertop Systems Diverter Valves Fitting & Adapters Faucets High pressure & Non Pressure Housings Reverse Osmosis & Alkaline Systems
- [About Us](https://qmpusa.com/about-us/): water filtration manufacturer headquartered in Valencia, California, with over 30 years of proven performance, innovation, and trust in the industry.
- [Home](https://qmpusa.com/): QMP is a water filtration system manufacturer based in Valencia, California, building residential reverse osmosis systems since 1994. We don't just sell filters. We engineer and manufacture them right here in the USA.