Tag: Local Limits Development

Local Limits: Determination of Suitable Environmental Criteria

This part of my series of blog entries gives a brief idea on the Environmental Criteria to be considered for the calculation of Allowable Headworks Loading (AHL). For each pollutant of concern identified, the POTW should examine the appropriate Environmental Criteria to protect against interference and pass through. From these criteria, along with the flow rates and removal […]


This installment of my blog series will give you a brief idea on the calculation of MAHLs. MAHL is an estimate of the upper limit of pollutant loadings to a POTW intended to prevent pass through or interference. MAHLs are the basis for local limits and are calculated in three steps: Calculate POTW removal efficiency for […]

Local Limits: Review and Analysis of Data

As mentioned in my previous blog, this blog entry looks at the review and analysis of data collected in order to develop Local Limits. Sampling data evaluations may reveal improperly collected data, elevated detection limits and new POCs. If data has been improperly collected, POTWs will want to educate the responsible person on data collection […]

LOCAL LIMITS: Collection and Analysis of Data

Since there was more than a month gap since my previous blog posts, I’ll review my previous blogs. In my last blog, I talked about the first step in the calculation of local limits which is Determination of Pollutants of Concern (POCs). Pollutants are designated as POCs, if they are: On EPA’s list of 15 POCs; A pre-existing local […]

Local Limits

This entry of my blog will talk about evaluating the need for local limits development. A POTW can evaluate their needs in three steps: 1)    I mentioned several factors relating to this topic in my previous blog.  In addition, EPA recommends that POTWs evaluating a pollutant for the first time should assume that local limits […]