Sure, most tap water in the U.S. meets federal Safe Drinking Water Act standards. But “meeting the minimum” isn’t the same as “clean.” Old pipes, farm runoff, factory waste, and even the chemicals used to disinfect water all add contaminants. A good point-of-use filter tackles these. The trick is knowing which filter is right for what’s actually in your water.

First, Test Your Water

Don’t buy any filter until you’ve tested your tap water. A real lab test, not one of those “free” ones from a salesperson, usually costs $50-150. It’ll tell you about TDS, nitrate levels, hardness, iron content, and if you have chlorine or chloramines. The EPA makes every city utility publish a Consumer Confidence Report (CCR) each year, so check yours first. If you’re on well water, you’ll also want to test for coliform bacteria, arsenic, and radon.

Common Filters and What They Do

Reverse Osmosis Systems

Reverse osmosis systems are your most thorough option for home use. A 5-stage or 6-stage RO system, installed under your kitchen sink, removes dissolved salts, fluoride, lead, arsenic, nitrates, chlorine, chloramines, and most PFAS compounds. It’s really effective, typically rejecting over 97% of lead and arsenic. Modern systems are efficient too, with waste ratios around 1:1 or 2:1, way better than older 4:1 systems. NSF International certifies RO systems under Standard 58 for what they claim to remove.

Carbon Block Filters

Carbon block filters are great at taking out chlorine, chloramines, and organic stuff that makes your water taste or smell off. They won’t remove dissolved minerals, heavy metals, or nitrates much. If your main worry is taste and your water’s TDS is already low, a carbon filter is a smart choice.

Water Softeners

Water softeners swap calcium and magnesium ions for sodium, which stops scale from building up in your pipes and appliances. If your water is hard, over 7 grains per gallon, a softener protects your water heater, washing machine, and dishwasher from dying too soon. The Water Quality Association (WQA) estimates about 85% of U.S. homes deal with hard water.

Ultrafiltration Systems

Ultrafiltration (UF) systems get rid of bacteria, viruses, and particles, but they leave the dissolved minerals in. They’re a good fit if your source water is pretty good already and you mostly want protection from microbes.

Water Filter Comparison Table

Filter Type	Removes Dissolved Minerals	Removes Lead/Arsenic	Removes PFAS	Removes Bacteria
Reverse Osmosis	Yes (95-99%)	Yes (>97%)	Yes (>94%)	Yes (with UV)
Carbon Block	No	Limited	Limited	No
Water Softener	Exchanges Ca/Mg	No	No	No
Ultrafiltration	No	No	No	Yes

PFAS: Our New Water Challenge

Per- and polyfluoroalkyl substances, often called “forever chemicals,” have shown up in water supplies near military bases, airports, and factories all over the U.S. In 2024, the EPA set the first federal Maximum Contaminant Level (MCL) for PFAS, limiting PFOA and PFOS to 4 parts per trillion. Right now, reverse osmosis is the most effective home technology for removing PFAS, cutting most compounds by over 94%. What’s in your water?

AMPAC USA Home and Commercial Water Filtration

AMPAC USA builds residential and commercial water filtration systems specifically for U.S. water chemistry. Our RO systems remove lead, coliform bacteria, and tannins, which affect both safety and taste. All our systems use NSF-certified components. Reach out to us at ampac1.com to talk about the best filtration solution for your water.