Water treatment guides

Reading a Consumer Confidence Report. The report lists detected contaminants against EPA's enforceable limits. Useful anchors: nitrate's limit is 10 mg/L, arsenic 0.010 mg/L, and lead is handled as a 0.010 mg/L action level with a treatment technique rather than a straight limit. Total coliform is a percentage-of-samples standard — no more than 5% positive monthly. EPA has also set drinking water limits for six PFAS, with PFOA and PFOS at 0.0000040 mg/L each and GenX at 0.00001 mg/L, plus a hazard index covering four PFAS in combination.

Getting an independent test. Independent means the lab does not sell treatment equipment. EPA directs well owners to state-certified labs and notes local health departments may provide testing at no cost. A professional hardness and basic analysis runs $130–$200 through private channels. Test again immediately if the taste, color or smell changes, or if ground conditions near the well change.

Understanding NSF certification. Certification is claim-specific. NSF/ANSI 42 covers aesthetic effects such as chlorine, taste, odor, particulate, iron, manganese, zinc and TDS. NSF/ANSI 53 covers health effects with over 50 reduction claims including lead, Cryptosporidium, VOCs and chromium. NSF/ANSI 401 covers emerging compounds like pharmaceutical residues and pesticides across up to 15 contaminants. NSF/ANSI 58 is reverse osmosis, 55 is UV, 44 is softeners, 62 is distillers. NSF/ANSI 60 and 61 cover treatment chemicals and system components rather than home appliances.

Judging salt-free conditioner claims. Ask one question: which standard, and which certified claim? Cation exchange softeners have NSF/ANSI 44. Conditioners that claim to prevent scale without removing minerals often have no comparable performance certification for softening. That does not make them useless, but it means the claim rests on the vendor rather than a third party — and they typically cost more installed ($1,500–$4,500) than a salt-based system ($1,200–$3,800).

How to choose

Find your CCR before you spend a dollar

It's free, it's already yours, and EPA requires your supplier to send it annually by July 1. It reframes the entire conversation with a salesperson.

Use a lab that sells nothing

State-certified labs and health departments have no equipment revenue. That is the whole point of an independent test.

Write the certified claim into the contract

"NSF/ANSI 53 certified for lead reduction, model X" is enforceable. "NSF certified premium system" is not.

Understand private wells are unregulated at the federal level

EPA's National Primary Drinking Water Regulations apply to public water systems. On a well, testing and treatment are entirely on you.

Slow down on PFAS marketing

EPA's PFAS limits are extremely low numbers, which makes them easy to use as a scare tactic. Check your CCR for actual detections before you buy anything sold on PFAS.