PUREWATERFILTER FINDER

Quiz Concerns Types Filters Guides My Water

Understand Your Water

Common Water Concerns and What to Check

Learn what may be in your water, when testing matters, and what proof to check before choosing a treatment system.

🔍

Emerging & PhysicalFederal MCL: 4.0 ppt each for PFOA and PFOS. Other PFAS rules and compliance timing may change, so check the current EPA page.

PFAS (Forever Chemicals / PFOA / PFOS)

Why people test: Linked to thyroid disease, kidney and testicular cancer, liver damage, weakened immune response, and developmental issues in infants.

Detection Signs: Completely odorless, colorless, and tasteless. Requires certified lab testing or public water utility PFAS reports.

⚠️ Marketing Myth vs Truth:Standard Brita pitchers and basic sediment filters do NOT remove PFAS. You need certified solid carbon block (NSF 53/P473) or Reverse Osmosis.

Treatment Types to Investigate:

undersink tankless roundersink tank rocountertop ro

Read the full contaminant guide

Heavy Metal & MineralFederal health goal: 0 ppb. The current Lead and Copper Rule uses a 15 ppb action level; the Lead and Copper Rule Improvements lower it to 10 ppb as systems implement the new rule.

Lead & Heavy Metals

Why people test: Severe neurological damage, cognitive and developmental deficits in children, high blood pressure, and kidney damage.

Detection Signs: Invisible and tasteless. Water sitting in pipes overnight accumulates higher concentrations.

⚠️ Marketing Myth vs Truth:Boiling water does NOT eliminate lead—it actually concentrates it as water evaporates. NSF 53 or 58 certification is mandatory.

Treatment Types to Investigate:

undersink tankless roundersink tank rocountertop ro

Read the full contaminant guide

Chemical & Disinfectant4.0 mg/L (Maximum Residual Disinfectant Level).

Chlorine (Free Chlorine)

Why people test: Chlorine can cause a noticeable taste or odor. It can also react with natural material in water to form separately regulated disinfection byproducts.

Detection Signs: Strong swimming pool or bleach-like chemical smell, especially noticeable in hot showers.

⚠️ Marketing Myth vs Truth:Easy to remove with basic activated carbon. However, many cities are switching to chloramine, which requires specialized catalytic carbon.

Treatment Types to Investigate:

pitcherfaucet mountcountertop ro

Read the full contaminant guide

Chemical & Disinfectant4.0 mg/L as maximum residual.

Chloramine (Chlorine + Ammonia)

Why people test: Some people notice taste, odor, or skin and eye irritation. Dialysis patients and aquarium owners need special handling because chloramine must be removed from their process water.

Detection Signs: Persistent chemical taste that does not dissipate when water is left in an open pitcher overnight.

⚠️ Marketing Myth vs Truth:Standard carbon pitchers and basic shower filters barely degrade chloramine. You must use high-grade Catalytic Carbon or Reverse Osmosis.

Treatment Types to Investigate:

countertop roundersink tankless roundersink tank ro

Read the full contaminant guide

Emerging & PhysicalNo enforceable federal drinking-water standard has been established for microplastics.

Microplastics & Nanoplastics

Why people test: Researchers are studying exposure and possible health effects, but the human health risk from microplastics in drinking water is not yet fully understood.

Detection Signs: Microscopic particles (sub-micron to 5mm). Invisible to naked eye without polarized microscopy.

⚠️ Marketing Myth vs Truth:Basic coarse sediment filters miss particles under 5 microns. Sub-micron carbon block, UF (0.02 micron), or RO (0.0001 micron) is needed.

Treatment Types to Investigate:

countertop roundersink tankless roundersink tank ro

Read the full contaminant guide

Heavy Metal & MineralSecondary aesthetic guideline (>180 mg/L or 10.5 GPG is classified as Very Hard).

Hard Water (Calcium & Magnesium Scale)

Why people test: Not harmful to drink (provides dietary calcium/magnesium), but ruins plumbing, clogs water heaters, destroys dishwashers, and leaves dry hair/itchy skin.

Detection Signs: Chalky white crust on faucets, spots on glassware, soap that will not lather, stiff laundry, reduced water pressure.

⚠️ Marketing Myth vs Truth:Shower head filters DO NOT soften water. Only a true ion-exchange water softener removes calcium and magnesium ions.

Treatment Types to Investigate:

whole house softenerwhole house salt freecountertop ro

Read the full contaminant guide

Heavy Metal & Mineral0.7 mg/L recommended target; 4.0 mg/L enforceable MCL limit.

Fluoride (Added or Naturally Occurring)

Why people test: Too much fluoride over time can cause dental fluorosis; much higher long-term exposure can affect bones.

Detection Signs: Completely odorless and tasteless in standard tap water.

⚠️ Marketing Myth vs Truth:Standard carbon filters (including Brita and PUR) do NOT remove fluoride. Requires Reverse Osmosis or Activated Alumina.

Treatment Types to Investigate:

countertop roundersink tankless roundersink tank ro

Read the full contaminant guide

Chemical & Disinfectant10 mg/L (as Nitrate-N).

Nitrates & Nitrites

Why people test: High nitrate can cause methemoglobinemia, a serious blood condition that is especially dangerous for infants. Researchers continue to study other long-term outcomes.

Detection Signs: Colorless, odorless, and tasteless. Well owners must test annually with certified lab kits.

⚠️ Marketing Myth vs Truth:Carbon filtration does not attract nitrate ions. Only Reverse Osmosis, Anion Exchange resin, or Distillation can remove nitrates.

Treatment Types to Investigate:

undersink tankless roundersink tank rocountertop ro

Read the full contaminant guide

Heavy Metal & Mineral10 ppb (0.010 mg/L).

Arsenic (Arsenic III & Arsenic V)

Why people test: Known Class 1 human carcinogen (bladder, lung, skin cancer); cardiovascular disorders and peripheral neuropathy.

Detection Signs: Invisible and flavorless in drinking water.

⚠️ Marketing Myth vs Truth:Standard carbon blocks cannot bind arsenic without specialized titanium/iron media. Reverse osmosis removes 95%+.

Treatment Types to Investigate:

undersink tankless roundersink tank rocountertop ro

Read the full contaminant guide

MicrobiologicalZero tolerance (0 coliform organisms per 100 mL).

Coliform Bacteria & E. Coli

Why people test: Cramping, severe diarrhea, vomiting, dehydration, potentially fatal hemolytic uremic syndrome.

Detection Signs: Often accompanied by turbidity or odor, but can be completely invisible without culture testing.

⚠️ Marketing Myth vs Truth:Water softeners and sediment filters do NOT disinfect water. UV disinfection (254nm light) is the gold standard for well water.

Treatment Types to Investigate:

whole house uvundersink ultrafiltrationundersink tankless ro

Read the full contaminant guide

Heavy Metal & Mineral0.3 mg/L (Iron), 0.05 mg/L (Manganese).

Iron & Manganese

Why people test: Secondary aesthetic guideline. High manganese exposure has neurodevelopmental risks in infants; causes severe aesthetic ruins.

Detection Signs: Reddish-orange rust stains on porcelain sinks, toilets, and laundry; black flakes; metallic bitter taste.

⚠️ Marketing Myth vs Truth:Ferrous iron (dissolved) is clear until exposed to oxygen. If levels exceed 2 ppm, specialized Air Injection Oxidation (AIO) is needed.

Treatment Types to Investigate:

whole house cartridgewhole house softenerundersink tankless ro

Read the full contaminant guide

Chemical & DisinfectantNo federal primary drinking-water MCL. It is usually handled as an odor, corrosion, or well-maintenance problem.

Hydrogen Sulfide (Rotten Egg Odor)

Why people test: Nauseating odor, tarnishes silver cutlery, corrosive to copper pipes and electrical contacts.

Detection Signs: Pungent rotten egg smell immediately when turning on the hot or cold tap.

⚠️ Marketing Myth vs Truth:If odor is only in the HOT water, the issue is often your water heater anode rod, not the well water source!

Treatment Types to Investigate:

whole house cartridge

Read the full contaminant guide

MicrobiologicalZero tolerance (99.9% removal requirement).

Giardia & Cryptosporidium Cysts

Why people test: Violent gastrointestinal infection (giardiasis, cryptosporidiosis) lasting weeks with severe cramping and weight loss.

Detection Signs: Microscopic cysts with thick protective shells unaffected by routine chlorine levels.

⚠️ Marketing Myth vs Truth:Chlorine alone does not reliably kill cryptosporidium due to its hard shell. Mechanical absolute sub-micron filtration or UV is required.

Treatment Types to Investigate:

undersink ultrafiltrationcountertop roundersink tankless ro

Read the full contaminant guide

Emerging & PhysicalNo single federal MCL covers pharmaceuticals as a group; individual compounds may be studied or listed for monitoring.

Pharmaceuticals & Endocrine Disruptors

Why people test: Trace pharmaceuticals are an active research area. Health effects depend on the individual compound and exposure, and are not established as one single contaminant group.

Detection Signs: Trace concentrations (parts per billion/trillion). No sensory indicators.

⚠️ Marketing Myth vs Truth:Look for NSF 401 certification, specifically tested for prescription drugs, OTC medications, and pesticides.

Treatment Types to Investigate:

undersink tankless rocountertop roundersink tank ro

Read the full contaminant guide

Emerging & PhysicalEPA turbidity treatment requirements vary by public-water system and treatment method; private wells are not covered by one federal household limit.

Sediment, Rust, Sand & Turbidity

Why people test: Grit damages valves, clogs aerators, ruins washer valves, and shields bacteria from UV disinfection.

Detection Signs: Cloudy or tea-colored water, visible sand particles, orange grit in toilet tanks.

⚠️ Marketing Myth vs Truth:Sediment must be removed at the whole-house point of entry; otherwise, it will prematurely ruin expensive water softeners and RO membranes.

Treatment Types to Investigate:

whole house cartridgeundersink carbonundersink ultrafiltration

Read the full contaminant guide

Heavy Metal & Mineral1.3 mg/L Action Level.

Copper (Corrosion Leaching)

Why people test: Gastrointestinal distress; chronic exposure can cause liver and kidney damage, especially in Wilsons disease patients.

Detection Signs: Blue-green stains on white porcelain tubs and sinks, bitter metallic taste.

⚠️ Marketing Myth vs Truth:Filtering copper at the sink solves drinking risk, but acidic water will eventually cause pinhole leaks in your pipes. A whole-house calcite neutralizer fixes the root cause.

Treatment Types to Investigate:

undersink tankless roundersink tank rocountertop ro

Read the full contaminant guide

Chemical & DisinfectantVaries by compound (e.g., Benzene 5 ppb, TCE 5 ppb).

VOCs (Volatile Organic Compounds)

Why people test: Liver damage, kidney disease, central nervous system depression, heightened cancer risk.

Detection Signs: Sweet solvent or gasoline-like chemical odor.

⚠️ Marketing Myth vs Truth:VOCs vaporize during hot showers and are inhaled into lungs. Whole house carbon filtration is crucial for contaminated municipal supplies.

Treatment Types to Investigate:

undersink carboncountertop roundersink tankless ro

Read the full contaminant guide