Question? Just ask us!
Free Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair
InspectAPedia ® Home
WATER PUMPS, TANKS, TESTS, WELLS, REPAIRS
WATER CONSERVATION MEASURES
WATER CONTAMINANT LEVELS
WATER FILTERS, HOME USE
WATER HAMMER NOISE DIAGNOSE & CURE
WATER ODORS, CAUSE CURE
WATER PUMP REPAIR GUIDE
WATER PRESSURE LOSS DIAGNOSIS & REPAIR
WATER PUMP SHORT CYCLING
WATER SOFTENERS & CONDITIONERS
WATER TANK REPAIR PROCEDURES
WATER TANK: USES, TROUBLESHOOTING
WATER TESTS, CONTAMINANTS, TREATMENT
WATER TREATMENT EQUIPMENT CHOICES
WELLS CISTERNS & SPRINGS
WELL CHLORINATION & DISINFECTION
WELL FLOW RATE
WELL WATER PRESSURE DIAGNOSIS
WELL YIELD IMPROVEMENT
WINTERIZE A BUILDING
Limits of allowable levels of water contaminants: when testing drinking water the contaminant limits listed here assist in deciding when water purification or other water treatment is needed. This table provides the allowable limits of various contaminants found in drinking water.
Green links show where you are. © Copyright 2014 InspectApedia.com, All Rights Reserved.
While the table of water contamination ingredients and allowable levels is from New York State, these limits or similar numbers will apply in most jurisdictions. Water contamination limits and testing requirements in the U.S. are regulated by the Federal Clean Drinking Water act.
Subpart 5-1 of the New York State Sanitary Code defines "Maximum Water Contaminant Level' as the permissible level of a contaminant in water which is delivered to any user of a public water system. New York State does not regulate private drinking water supplies (single family homes on well water).
Most lenders require at least a confirmation of "potable" water meaning that bacteria count and coliform bacteria count is less than 1 CFU per 100 ml. of drinking water in the water test sample. Some lenders require water passing the FHA "Short" or FHA "Long" test list items. Readers of this article should also see Drinking Water Supply, Contamination Levels, Water Testing Procedures.
Notes about drinking water contaminant acceptable levels
(a) mg/L = milligrams per liter
(b) If iron and manganese are present, the total concentration of both should not exceed 0.5 mg/L.
© Water containing more than 20 mg/L of sodium should not be used for drinking by people of severely restricted sodium diets. Water containing more than 270 mg/L of sodium should not be used for drinking by people on moderately restricted sodium diets.
(d) Color test result expressed as Platinum Cobalt Color Units
(e) Odor test result expressed as Threshold Odor Number
(f) If nitrate and nitrite are present, the total concentration of both should not exceed 10 mg/L.
(g) "Action level" is the concentration of lead or copper (in a sample of water drawn from a tap normally used for drinking after a 6-hour period of no water use) that, when exceeded, triggers actions to be taken by a water system.
(h) FHA "Short List" items
(i) FHA "Long List" items - (indications to be added after lab review)
Green link shows where you are in this article series.
Frequently Asked Questions (FAQs) about Well Water Quality & Water Contaminant Levels
Please help! I am stumped, how am i getting good readings at my well when im not adding any chlorine and still getting good readings through out all my mobile home rentals? - Smitty Smith 6/28/12
If you mean a bacteria test that is not showing any bacterial contamiantion, if the current water coming into your system is not contaminated with bacteria it won't show up, chlorine or not.
Questions & answers or comments about allowable levels of contaminants in drinking water.
Try the search box just below or if you prefer, post a question or a comment in the Comments box below and we will respond promptly.
Search the InspectApedia website
HTML Comment Box is loading comments...
Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.
More Information about Drinking Water Testing and Allowable Levels of Water Contaminants