How to Choose the Right Water Filter

Written by Craig "The Water Guy" Phillips

Choosing the right water filter starts with knowing what's actually in your water. We recommend pulling your utility's Consumer Confidence Report first, then testing with a certified lab for a fuller picture. From there, match your filter's NSF certifications to your specific contaminants. Refrigerator filters handle chlorine, taste, and basic metals well, but serious issues like nitrates or PFAS may require an under-sink reverse osmosis system. Stick around — there's a lot more to uncover.

Key Takeaways

• Test your tap water first using a lab test or Consumer Confidence Report to identify specific contaminants before selecting any filter.
• Match filter certifications to your contaminants: NSF/ANSI 53 for lead, 58 for reverse osmosis performance, and 401 for pharmaceuticals.
• Refrigerator filters effectively reduce chlorine, taste, and basic metals but cannot remove nitrates, fluoride, or dissolved salts.
• Choose an under-sink reverse osmosis system for comprehensive contaminant removal, including PFAS and fluoride, if serious issues exist.
• Replace cartridges every six months and flush new filters thoroughly to prevent bacterial growth and manufacturing residue contamination.

What's Actually in Your Refrigerator's Water?

Most of us assume our refrigerator's built-in filter is handling everything, but what's actually coming out of that dispenser might surprise you. Municipal treatment doesn't eliminate every threat—lead from household pipes, disinfection byproducts like trihalomethanes, and PFAS can all survive the journey to your glass. Chlorine, sediment, copper, and iron are more common culprits that better-quality filters can reduce.

Refrigerator filters certified to NSF/ANSI 42 target taste and odor, while NSF 53 certification addresses health-related contaminants like lead. Neglected filter cartridges or aging water lines can introduce coliform bacteria, making regular replacement non-negotiable.

Want certainty? Test your water directly—your utility's Consumer Confidence Report is a starting point, but lab testing catches what smell and taste can't.

Which Refrigerator Filter Technology Removes Your Contaminants?

Once we grasp what's lurking in our water, the next step is matching the right filter technology to those specific threats. Not all refrigerator filters perform equally, so knowing your options matters.

1. Carbon block cartridges outperform granular activated carbon—denser structure means better contact time and higher removal efficiency for lead and VOCs.
2. NSF/ANSI Standard 42 certifies chlorine, taste, and odor reduction.
3. NSF/ANSI Standard 53 certifies health-related contaminants like lead and select VOCs.
4. Refrigerator filters won't touch nitrates, fluoride, perchlorate, or dissolved salts—those require reverse osmosis.

Here's our recommendation: test your tap water first, then cross-reference your specific filter model's certified contaminant list rather than trusting marketing language. Certifications tell the real story.

Refrigerator Filters vs. Under-Sink Systems: Which Do You Need?

Now that we've covered what refrigerator filters can and can't do, the real question is whether they're enough for your situation—or whether you need the heavier artillery of an under-sink system.

Refrigerator filters excel at taste, odor, and basic metal reduction—ideal for renters who can't modify plumbing and don't face serious contaminant issues.

They're low-cost and dead simple to maintain.

But if your tap water tests positive for PFAS, nitrates, arsenic, or fluoride, you need an under-sink reverse osmosis system.

RO removes a far broader contaminant spectrum, carries NSF/ANSI 53/58 certifications, and delivers higher daily capacity—though it requires installation space and wastes roughly three to five gallons per gallon produced.

Test your water first.

That single step tells you exactly which system you actually need.

What NSF Certifications Tell You About Filter Performance

When a filter claims it removes lead or chlorine, NSF certifications are how you verify that's actually true—not just marketing. Independent labs test filters against specific standards, so we're certain exactly what's been proven versus assumed.

Here's what each key standard covers:

1. NSF/ANSI 42 – Verified reduction of chlorine, taste, and odor
2. NSF/ANSI 53 – Health-related contaminants like lead and cysts
3. NSF/ANSI 58 – Reverse osmosis system performance
4. NSF/ANSI 401 – Emerging contaminants like pharmaceuticals

Certification listings specify tested contaminants and exact reduction rates—not vague percentages. Without certification, you're trusting manufacturer claims alone.

We recommend cross-referencing NSF, WQA, or IAPMO databases before purchasing to confirm what a filter actually removes under standardized conditions.

How to Test, Install, & Maintain Your Refrigerator Water Filter

Knowing your filter is certified is only half the job—getting it installed correctly and keeping it maintained is what actually protects your water long-term.

Start by locating your fridge's model number—check the interior ceiling, door frame, or kickplate—then confirm the correct cartridge using the manufacturer's Filter Finder or everydrop® model list.

After installation, flush several gallons through the new filter to clear manufacturing residues.

Replace every six months or when flow drops noticeably, and wear gloves during swaps to avoid contaminant transfer.

Keep a log of replacement dates so nothing slips.

One often-overlooked step: test your tap water first. Carbon filters handle taste and some metals well, but they won't catch everything—especially PFAS or bacteria—so know what you're actually filtering before assuming you're covered.

Frequently Asked Questions

Where Can I Find My Refrigerator's Full Model Number?

You'll find your refrigerator's full model number on a label inside the fridge, typically on the interior wall, door frame, or behind the crisper drawer. We recommend checking all three spots if it's not immediately visible.

What Everydrop® Filter Models Are Compatible With My Refrigerator?

Once you've got your full model number, plug it into EveryDrop's compatibility tool at everydropwater.com. We'll match you with the exact filter your refrigerator needs, ensuring clean, filtered water without guesswork.

What Should I Do if the Filter Finder Shows No Matches?

If our filter finder shows no matches, we recommend checking your refrigerator's model number again—it's easy to misread. You can also contact our customer support team directly; we'll help you find the perfect fit.

Which Refrigerator Brands Are Compatible With Everydrop® Water Filters?

EveryDrop® filters are compatible with Whirlpool, Maytag, KitchenAid, Amana, and JennAir refrigerators. We recommend checking your specific model number to confirm compatibility, as filter requirements can vary even within the same brand's product lineup.

Who Should I Contact if I Need Help Choosing the Right Filter?

If you're unsure which filter fits your needs, we recommend reaching out to the filter manufacturer's customer support team directly. They'll guide you through compatibility, contaminant reduction, and certifications to make certain you're getting the best filtration solution.