US wastewater by state
Share of each state's sampling sites that CDC rates High or Very High for this pathogen, from viral genetic material measured in sewage. It counts infections whether or not anyone was tested. Back to World Pulse.
Pathogen
Influenza A virus
RSV
SARS-CoV-2
Week ending
10-31
10-24
10-17
10-10
10-03
09-26
09-19
09-12
0%100% of sites High+
grey = no sites reporting
National trend — share of sites High or Very High
33 weeks · latest
29% of
884 sites
States, week of 2026-10-31
| State | High+ | Sites | Median |
|---|---|---|---|
| District of Columbia | 100% | 1 | 14.3 |
| Tennessee | 100% | 2 | 10.0 |
| Massachusetts | 83% | 6 | 12.1 |
| Missouri | 79% | 24 | 9.4 |
| Arkansas | 75% | 4 | 13.1 |
| Oregon | 64% | 22 | 9.4 |
| Florida | 64% | 11 | 8.8 |
| Virginia | 63% | 30 | 10.2 |
| Connecticut | 57% | 7 | 8.9 |
| California | 51% | 65 | 8.1 |
| Hawaii | 50% | 4 | 9.7 |
| Montana | 50% | 2 | 8.8 |
| Utah | 50% | 32 | 8.1 |
| South Carolina | 50% | 22 | 7.7 |
| Idaho | 50% | 4 | 7.5 |
| North Carolina | 47% | 34 | 7.0 |
| West Virginia | 45% | 11 | 4.7 |
| Washington | 42% | 26 | 7.3 |
| Pennsylvania | 42% | 12 | 4.9 |
| Wisconsin | 41% | 29 | 6.1 |
| New Jersey | 40% | 25 | 6.6 |
| Nevada | 40% | 5 | 4.8 |
| Delaware | 33% | 9 | 6.2 |
| Georgia | 33% | 15 | 6.1 |
| Maine | 33% | 15 | 6.0 |
| Vermont | 33% | 3 | 4.0 |
| Kansas | 29% | 14 | 4.9 |
| South Dakota | 25% | 4 | 6.0 |
| Alaska | 25% | 4 | 2.9 |
| Texas | 22% | 23 | 3.9 |
| Mississippi | 20% | 5 | 6.7 |
| Alabama | 20% | 5 | 4.8 |
| New Hampshire | 19% | 16 | 4.2 |
| Wyoming | 17% | 6 | 4.6 |
| Illinois | 14% | 72 | 3.8 |
| Michigan | 14% | 22 | 2.1 |
| Maryland | 12% | 8 | 3.7 |
| Rhode Island | 8% | 12 | 4.5 |
| Colorado | 8% | 24 | 4.4 |
| Iowa | 8% | 12 | 2.4 |
| Indiana | 7% | 27 | 2.3 |
| Kentucky | 6% | 17 | 4.5 |
| Ohio | 5% | 57 | 2.6 |
| New York | 4% | 85 | 1.0 |
| Louisiana | 0% | 2 | 4.0 |
| New Mexico | 0% | 4 | 3.3 |
| Arizona | 0% | 2 | 2.7 |
| Nebraska | 0% | 16 | 2.6 |
| U.S. Virgin Islands | 0% | 1 | 1.7 |
| Minnesota | 0% | 26 | 1.0 |
What the numbers are. CDC's wastewater viral activity level (WVAL) is an index per sampling
site per week, binned into Very Low / Low / Moderate / High / Very High using pathogen-specific cutoffs. The
map colours the share of a state's sites in the top two bins, because the index itself has no intuitive scale
and one outlier site can reach five figures. "Median" is that state's middle site.
Caveats. Sites are not evenly spread: a state with three sites is three towns, not a state. Puerto Rico, the Virgin Islands and any state without a boundary in the map file appear in the table only. Source: CDC NWSS (public domain), updated Fridays.
Caveats. Sites are not evenly spread: a state with three sites is three towns, not a state. Puerto Rico, the Virgin Islands and any state without a boundary in the map file appear in the table only. Source: CDC NWSS (public domain), updated Fridays.