Question 1

Is Clay RWS/South Union water safe to drink?

Accepted Answer

Clay RWS/South Union (PWS ID: SD4602185) has 331 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 1,447 people using Groundwater sources.

Question 2

How many people does Clay RWS/South Union serve?

Accepted Answer

EPA SDWIS reports that Clay RWS/South Union serves 1,447 people (this public water system's service population, not the municipal population of Wakonda or any other city). It is a Private-owned system using Groundwater water sources with 579 service connections. The operator address is listed in Wakonda, South Dakota.

Question 3

What type of violations does Clay RWS/South Union have?

Accepted Answer

Clay RWS/South Union has 331 total violations: 0 health-based violations (MCL exceedances or treatment failures), 329 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Clay RWS/South Union water?

Accepted Answer

No PFAS testing data is available for Clay RWS/South Union under the EPA's UCMR5 monitoring program.

Question 5

What water source does Clay RWS/South Union use?

Accepted Answer

Clay RWS/South Union 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

Where does Clay RWS/South Union sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Clay RWS/South Union ranks #16,314 of 29,740 by people served, and #76 of 171 in South Dakota. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Clay RWS/South Union's violation count compare nationally?

Accepted Answer

Clay RWS/South Union has 331 recorded EPA SDWIS violations, fewer than 8% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 92% of that cohort has fewer violations than Clay RWS/South Union. 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)	MR	7	2000
Lead and Copper Rule	MR	7	2000
LASSO	MR	6	2004
Heptachlor	MR	6	2004
Benzo(a)pyrene	MR	6	2004
Methoxychlor	MR	6	2004
Di(2-ethylhexyl) adipate	MR	6	2004
Di(2-ethylhexyl) phthalate	MR	6	2004
Hexachlorocyclopentadiene	MR	6	2004
Endrin	MR	6	2004
HEXACHLOROBENZENE	MR	6	2004
Toxaphene	MR	6	2004
Simazine	MR	6	2004
OXAMYL	MR	6	2004
2,4,5-TP	MR	6	2004
Pentachlorophenol	MR	6	2004
1,2-DIBROMO-3-CHLOROPROPANE	MR	6	2004
ETHYLENE DIBROMIDE	MR	6	2004
Endothall	MR	6	2004
Glyphosate	MR	6	2004
Heptachlor epoxide	MR	6	2004
Atrazine	MR	6	2004
Chlordane	MR	6	2004
Carbofuran	MR	6	2004
Diquat	MR	6	2004
BHC-GAMMA	MR	6	2004
Dalapon	MR	6	2004
2,4-D	MR	6	2004
Dinoseb	MR	6	2004
Picloram	MR	6	2004

Clay RWS/South Union

Clay RWS/South Union standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Health-based violations on Clay RWS/South Union

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems near this population served