Don's Home Health | National Wastewater Sewer Alert Network (SCAN)) Contact
The National Wastewater Sewer Coronavirus Alert Network (SCAN) has expanded with levels and trends for 10 different pathogens Nationally:

Studies in 2020 and 2021 when there was good clinical date showed a correlation between wastewater levels of SARS-CoV-2 (the virus that causes COVID-19) RNA and COVID-19 cases.
See wastewater testing June 2024 National
Pathogen Concentration
Category *
SARS-CoV-2 High Up
Upward trend
in the last 21 days
RSV Low Pathogen is seasonal
and not in onset
Influenza A Low
Influenza B Low
Norovirus Medium Downward
Mpox low 0 out of 393 samples
in the past 10 days were positive
Rotavirus Medium No trend in the last 21 days
EVD68 Low 14 out of 363 samples
in the past 10 days were positive
Candida auris fungus11 out of 363 samples in the
past 10 days were positive
Hepatitis A Low37 out of 363 samples in the
past 10 days were positive
* See About Wastewater dashboard below

SARS-CoV-2 levels for regions:
Northeast and South are high
West and Midwest are medium.

Go to the Dashboard to find your town on the map for data.

See Wastewater SCAN West for SARS–CoV–2,: AK, AZ, CA, CO, HI, ID, MT, NM, NV, OR, UT, WA, WY

June 2024 Half Moon Bay

National Wastewater Sewer Alert Network (SCAN) Levels For SARS-CoV-2 June 22, 2024
23 High sites
18 Medium sites
 9 Low sites
Location Concentration
Nation High
West & Midwest Medium
Northeast & South High
23 High sites
18 Medium sites
9 Low sites
50 Total SCAN sites
Sacramento High
Woodland Low
Davis High
Winters Low
Napa High
Half Moon bay Medium
Palo Alto Low

About Wastewater dashboard What is measured (the target)
For SARS and Influenza RNA is measured.
The message encoded by the nucleocapsid (N) gene is the most abundant during viral infection. PCR is used to amplify the N gene and give a target number. [My son and daughter-in-law, who are neuroscientists, know what this means. I haven't a clue.]
Measurements are normalized to average out daily variations by measuring Pepper mild mottle virus (PMMoV) which is common in wastewater.
They use the target/PPMoV ratio times 1 million which is unitless to produce a level used the charts called "Quantity of Nucleic-acids".
Unitless number on the charts 
called "Quantity of Nucleic-acids"
 on the chart: 
National     110-425
West         100-575
Davis         35-425
Sacramento    70-450
Half Moon Bay 70-500
The trend is the comparison of the current 5 day average value with one 3 weeks earlirer.

How are categories (High, Medium, Low) determined:
Using the range of values from the last year, levels are divided into thirds (lower=<33rd percentile) etc.)
Wastewater Category (High-Medium-Low) is a function of Level and trend
You may notice that the top third area often represents a larger range than the middle or bottom - this is because there is typically more variability in the concentrations in the top of third of data points.

See wastewater testing