Mea culpa! I miswrote about the ammonia. It's *not* regulated. However, nitrites cannot be over 1 ppm when coming from the tap. If your nitrite levels are above 1 ppm, please contact your local water supplier; your health is important.
<< EPA has set an enforceable regulation for nitrite, called a maximum contaminant level (MCL), at 1 mg/L or 1 ppm. (snip) When routine monitoring indicates that nitrite levels are above the MCL, your water supplier must take steps to reduce the amount of nitrite so that it is below that level. Water suppliers must notify their customers as soon as practical, but no later than 24 hours after the system learns of the violation. Additional actions, such as providing alternative drinking water supplies, may be required to prevent serious risks to public health.>>