December 22, 2025

AQS Reference Table

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To sort on a column, click the column header. That column will be (subtly) highlighted. Particularly useful is the search box at the top of the table on the right. Separate mulitiple search terms with a space. Search looks across all columns in the table.

Downoad a csv version: collection_frequencies.csv

Frequency Code	Frequency Description
1	EVERY DAY
10	EVERY 24TH DAY
11	EVERY 30 DAYS
2	EVERY OTHER DAY
3	EVERY 3RD DAY
4	EVERY 4TH DAY
5	EVERY 5TH DAY
6	EVERY 6TH DAY
7	EVERY 12TH DAY
8	STRATIFIED RANDOM
9	RANDOM
90	EVERY 90 DAYS
A	DAILY: 24 - 1 HR SAMPLES -PAMS
B	DAILY: 8 - 3 HR SAMPLES - PAMS
C	DAILY: 1 - 3 HR SAMPLE - PAMS
D	DAILY: 1 - 24 HR SAMPLE - PAMS
E	DAILY: 4 - 6 HR SAMPLES - PAMS
F	DAILY: 4 - 3 HR SAMPLES - PAMS
G	EVERY 3RD DAY:24-1 HR - PAMS
H	EVERY 3RD DAY:8-3 HOUR - PAMS
I	EVERY 3RD DAY:1-3 HR - PAMS
J	EVERY 3RD DAY:1-24 HR - PAMS
K	EVERY 3RD DAY:4-6 HR - PAMS
L	EVERY 3RD DAY:4-3 HR - PAMS
M	EVERY 6TH DAY:24-1 HR - PAMS
N	EVERY 6TH DAY:8-3 HR - PAMS
O	EVERY 6TH DAY:1-3 HR - PAMS
P	EVERY 6TH DAY:1-24 HR - PAMS
Q	EVERY 6TH DAY:4-3 HR - PAMS
R	EPISODIC SAMPLING
S	SEASONAL
T	5 OUT OF 7 DAYS (FOR PSI)
U	EVERY 6TH DAY: 3-3 HR - PAMS