Tap Water Results

Drinking water contaminants

Federal limits, health guidelines and national results for each contaminant we track.

PFAS

ContaminantLimitSystems detectedOver limit
PFOA4 ppt1,273755
PFOS4 ppt1,318849
PFHxS10 ppt1,01463
PFNA10 ppt789
HFPO-DA (GenX)10 ppt478
PFAS Hazard Index11,94477
PFBS2,000 ppt (guideline)1,6710
PFBA6,000 ppt (guideline)1,8910
PFHxA3,000 ppt (guideline)1,7610

Metals

ContaminantLimitSystems detectedOver limit
Lithium10 ppb (guideline)3,6102,627
Chromium-6–4,2570
Strontium1.5 ppm (guideline)4,734273
Vanadium21 ppb (guideline)3,511161
Molybdenum40 ppb (guideline)2,43436
Cobalt70 ppb (guideline)2413
Manganese300 ppb (guideline)4,947124
Lead15 ppb (guideline)26,263414
Copper1.3 ppm (guideline)974974
Arsenic10 ppb726726

Industrial

ContaminantLimitSystems detectedOver limit
1,4-Dioxane0.35 ppb (guideline)1,046334
1,2,3-Trichloropropane (TCP)0.0004 ppb (guideline)6565

Disinfection

ContaminantLimitSystems detectedOver limit
Chlorate210 ppb (guideline)3,2731,823
Total trihalomethanes (TTHM)80 ppb2,6412,641
Haloacetic acids (HAA5)60 ppb1,4951,495

Agricultural

ContaminantLimitSystems detectedOver limit
Nitrate10 ppm495495
Nitrate-nitrite10 ppm138138
Nitrite1 ppm2626

Radioactive

ContaminantLimitSystems detectedOver limit
Radium (combined 226/228)–378378
Gross alpha–275275
Uranium30 ppb171171

Minerals

ContaminantLimitSystems detectedOver limit
Fluoride4 ppm101101

Microbial

ContaminantLimitSystems detectedOver limit
Coliform bacteria–2,5722,572