Question 1

Is Merrimac Waterworks water safe to drink?

Accepted Answer

Merrimac Waterworks (PWS ID: WI1570093) has 85 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 440 people using Groundwater sources.

Question 2

How many people does Merrimac Waterworks serve?

Accepted Answer

EPA SDWIS reports that Merrimac Waterworks serves 440 people (this public water system's service population, not the municipal population of Merrimac or any other city). It is a Local-owned system using Groundwater water sources with 162 service connections. The operator address is listed in Merrimac, Wisconsin.

Question 3

What type of violations does Merrimac Waterworks have?

Accepted Answer

Merrimac Waterworks has 85 total violations: 15 health-based violations (MCL exceedances or treatment failures), 60 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Merrimac Waterworks water?

Accepted Answer

No PFAS testing data is available for Merrimac Waterworks under the EPA's UCMR5 monitoring program.

Question 5

What water source does Merrimac Waterworks use?

Accepted Answer

Merrimac Waterworks uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Question 6

Where does this data come from?

Accepted Answer

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Question 7

How does Merrimac Waterworks's violation count compare nationally?

Accepted Answer

Merrimac Waterworks has 85 recorded EPA SDWIS violations, fewer than 30% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 70% of that cohort has fewer violations than Merrimac Waterworks. A system can have zero recorded violations and still be actively monitored, and a high violation count often reflects a system that reports thoroughly, not necessarily one with worse water.

Contaminant	Category	Count	Latest
Coliform (TCR)	MCL	10	2002
Coliform (TCR)	MR	7	2002
Consumer Confidence Rule	Other	5	2013
Lead and Copper Rule	TT	4	2018
Lead and Copper Rule	MR	3	2012
Endrin	MR	2	1993
BHC-GAMMA	MR	2	1993
Methoxychlor	MR	2	1993
Toxaphene	MR	2	1993
OXAMYL	MR	2	1993
Picloram	MR	2	1993
Hexachlorocyclopentadiene	MR	2	1993
Carbofuran	MR	2	1993
Heptachlor epoxide	MR	2	1993
2,4-D	MR	2	1993
2,4,5-TP	MR	2	1993
Aldicarb	MR	2	1993
Total Polychlorinated Biphenyls (PCB)	MR	2	1993
Pentachlorophenol	MR	2	1993
Atrazine	MR	2	1993
Dinoseb	MR	2	1993
Dalapon	MR	2	1993
Heptachlor	MR	2	1993
Chlordane	MR	2	1993
HEXACHLOROBENZENE	MR	2	1993
Simazine	MR	2	1993
LASSO	MR	2	1993
Aldicarb sulfone	MR	2	1993
Aldicarb sulfoxide	MR	2	1993
2,3,7,8-TCDD	MR	2	1999

Merrimac Waterworks

Merrimac Waterworks standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Merrimac Waterworks

Nationwide peers

Cross-state systems with comparable violation load