Groundwater Rule Total Coliform Rule Nitrate and Nitrite Rule Inorganic Chemicals Rule MCLs and MCLGs

100

What is 0.2 mg/L
The disinfectant residual must be equal or greater than this at each entry point and throughout the distribution system.

100

What is Too Numerous To Count
TNTC stands for:

100

What is Methemoglobanemia, also known as Blue Baby Syndrome
The MCL for nitrate is designed to protect babies from this

100

What are Asbestos, Cyanide, or Fluoride
The Inorganic Chemicals Rule sets MCLs for 13 consitutents; most of them heavy metals. Name one of the 3 that is not a heavy metal.

100

What are 10 mg/L as N and 1 mg/L as N, respectively
The MCLs for Nitrate and Nitrite are:

200

What is Ground Water Under the Direct Influence (of Surface Water)
GWUDI stands for

200

What is in the Distribution System
Samples collected to demonstrate compliance with the Total Coliform Rule are taken here:

200

What is the water will not be available to children under 6 months of age AND it will not result in any adverse health effects.
Non-Community Water Systems may be allowed to provide water with nitrate concentrations as high as 20 mg/L as N under these conditions:

200

What is the Fluoride MCL of 4.0 mg/L
If you are a Transient, Non-Community Water supplier, only one of the MCLs in the Inorganic Chemicals Rule applies to you. Which one?

200

What is 0.010 mg/L or 10 ug/L
What is the MCL for Arsenic?

300

What is Yes.
Do the requirements of the Groundwater Rule apply to consecutive systems?

300

What is Population Served
The minimum number of Total Coliform samples that must be collected depends on:

300

What is at Entry Points
Samples for nitrate and nitrite are collected here:

300

What are Arsenic and Selenium
Many groundwater systems in Colorado have high concentrations of these two heavy metals naturally occurring in their groundwater and must treat to remove it.

300

What is Chlorine (Disinfectant)
Which constituent that we monitor for in water and distribution, has both a minimum required concentration and an MCL.

400

What is Microbial
The Groundwater rule protects users from this category of contaminant.

400

What is in the Individual Rule Sampling Plan within the Monitoring Plan
Sampling locations must be preapproved by the State and are listed here:

400

What is Quarterly
Community and Non-Transient, Non-Community surface water systems are required to sample for nitates this often.

400

What is After blending provided that samples are taken under typical operating conditions.
If a system pulls water from more than one source, where is compliance with the Inorganic Chemicals Rule determined?

400

What is 2 mg/L
Flouride concentrations higher than this may cause dental fluorosis or discoloring of adult teeth.

500

What is water is being supplied to the public and there is no waiver in place.
Groundwater suppliers are required to disinfect the water using a chemical treatment method under these circumstances.

500

What is At least 3 -- repeat, one upstream, and one downstream. For systems that only collect one sample per monitoring period, a minimum of 4 is required.
A routine Total Coliform sample result is positive. What is the minimum number of repeat samples required?

500

What is Groundwater characteristics change slowly
While surface water systems must sample for nitrate quarterly, groundwater systems only have to monitor once per year because of this:

500

What is Notify the State within 48 hours AND issue Tier 2 notices.
A water system reports arsenic results for four entry points. One entry point has had arsenic concentrations higher than 12 ug/L for the last four consecutive quarters. The system must:

500

What are Public Health / Aesthetic (Nuisance)
Primary MCLs protect _____________ while Secondary MCLs are ______________.

Colorado Primary Drinking Water Regulations - Part 1

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