Door County Private Well Monitoring Program

Past Testing Results

The common contaminants that are tested for in the study have been bacteria in the form of Total Coliform and E. coli and Nitrate. The following table summarizes the results from 2019 - 2023. The numbers displayed show the percentage of Door County wells indicating various levels of contaminants compared to Wisconsin averages.

Water Quality Standard 
(Level Detected)
Fall 2023 (162 wells)
Spring 2023 
(195 wells)
Fall 2022
(196 wells)
Spring 2022 
(260 wells)
2021
(217 wells)
2020 
(295 wells)
2019 
(148 wells)
Wisconsin Average
Total Coliform (0 MPN/100 ml)
88%
95%92%90%
76%
86%
84%
17%
(>0 MPN/ 100 ml)
Total Coliform (1-10 MPN/100 ml)6%5%6%6%
14%
9%10%
Total Coliform (10-100 MPN/100 ml)4%0%2%3%
6%
3%4%
Total Coliform (>100 MPN/100 ml)2%

<1%1%1%
3%
1%1%
E.coli (0 MPN/100 ml)98%100%100%99%
98%
99%100%5%
(>0 MPN/ 100 ml)
E.coli (1-10 MPN/100 ml)1%0%0%<1%
1%
1%0%
E.coli (10-100 MPN/100 ml)1%0%0%0%
<1%
0%0%
E.coli (>100 MPN/100ml)0%0%0%0%
0%
0%0%
Nitrate (0 mg/L)72%77%74%80%
75%
72%71%8%
(>10 mg/L)
Nitrate (2-5 mg/L)18%16%18%16%
11%
16%
16%
Nitrate (5-10 mg/L)(>10 mg/L)8%5%7%4%
12%
12%
11%
Nitrate (>10 mg/L)2%3%1%0%
2%
<1%
2%
Arsenic (<2 µg/L)91%89%92%88%
89%
90%
99%
5%
(>10 µg/L)
Arsenic (2-5 µg/L)5%10%7%11%
9%
6%
1%
Arsenic (5-10 µg/L)4%0%1%1%
1%
3%
0%
Arsenic (>10 µg/L)0%<1%0%0%
1%
<1%
0%


2023 Fall UW-Oshkosh Presentation of the Door County Well Monitoring Program (pdf)

2023 Spring UW-Oshkosh Presentation of the Door County Well Monitoring Program (pdf)

2023 Spring UW-Ohskosh Recorded presentation of the Door County Well Monitoring Program


2022 Fall UW-Oshkosh Presentation of the Door County Well Monitoring Program (pdf)

2022 Fall UW-Oshkosh Recorded Presentation of the Door County Well Monitoring Program

2022 Spring UW-Oshkosh Presentation of the Door County Well Monitoring Program (pdf)

2022 Spring UW-Oshkosh Recorded Presentation of the Door County Well Monitoring Program


2021 UW-Oshkosh Presentation of the Door County Well Monitoring Program (pdf)
2021 UW-Oshkosh Recorded Presentation of the Door County Well Monitoring Program


2020 UW-Oshkosh Presentation of the Door County Well Monitoring Program (pdf)

2020 UW-Oshkosh Door County Well Monitoring Final Report (pdf)
2020 UW-Oshkosh Recorded Presentation of the Door County Well Monitoring Program


2019 UW-Oshkosh Presentation of the Door County Well Monitoring Program (pdf)


2024 Private Well Monitoring Program

Registration for the spring 2024 study is in progress!

UW-Oshkosh Spring 2024 Door County Private Well Monitoring Program Flyer (pdf)

Testing Parameters

  • Total coliforms/ E. coli (quantification)
  • Nitrate (Nitrate + nitrate as N)
  • Optional – arsenic, pH, alkalinity, hardness and iron

Cost

  • The first 300 registrants will receive a discount and the base parameters will be $30
  • Those registering after the first 300 registrants will pay $45 for the base parameters
  • The cost of the optional parameters is an additional $25
  • If you are not able to finance the above cost, there is limited funding available to offer financial assistance. Please contact our office for more information.

Event Details

  • Registration will be accepted through March 22, 2024
  • Once payment is received, your sample material will be mailed to you
  • Virtual forums will be available to review sampling procedure
  • Collect your sample and drop off on April 5 or April 6 at one of the designated locations during the established drop off times

Registration

Register online at: https://uwo.sh/doorco-wells-spring24

Or use the following:

QR Code for Spring 2024 Testing