Question 1

Is Yarnell Water Improvement Association water safe to drink?

Accepted Answer

Yarnell Water Improvement Association (PWS ID: AZ0413057) has 157 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 515 people using Groundwater sources.

Question 2

How many people does Yarnell Water Improvement Association serve?

Accepted Answer

EPA SDWIS reports that Yarnell Water Improvement Association serves 515 people (this public water system's service population, not the municipal population of Prescott or any other city). It is a Private-owned system using Groundwater water sources with 523 service connections. The operator address is listed in Prescott, Arizona.

Question 3

What type of violations does Yarnell Water Improvement Association have?

Accepted Answer

Yarnell Water Improvement Association has 157 total violations: 1 health-based violations (MCL exceedances or treatment failures), 126 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 Yarnell Water Improvement Association water?

Accepted Answer

No PFAS testing data is available for Yarnell Water Improvement Association under the EPA's UCMR5 monitoring program.

Question 5

What water source does Yarnell Water Improvement Association use?

Accepted Answer

Yarnell Water Improvement Association 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 Yarnell Water Improvement Association sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Yarnell Water Improvement Association ranks #28,249 of 29,740 by people served, and #397 of 413 in Arizona. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Yarnell Water Improvement Association's violation count compare nationally?

Accepted Answer

Yarnell Water Improvement Association has 157 recorded EPA SDWIS violations, fewer than 18% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 82% of that cohort has fewer violations than Yarnell Water Improvement Association. 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
Chlorine	MR	41	2022
Coliform (TCR)	MR	16	2014
Consumer Confidence Rule	Other	15	2023
Lead and Copper Rule	MR	7	2021
Total Haloacetic Acids (HAA5)	MR	3	2008
Revised Total Coliform Rule	RPT	3	2022
Revised Total Coliform Rule	MON	3	2016
TTHM	MR	3	2008
1,2-Dichloroethane	MR	2	2011
1,1,1-Trichloroethane	MR	2	2011
Carbon tetrachloride	MR	2	2011
1,2-Dichloropropane	MR	2	2011
Trichloroethylene	MR	2	2011
1,1,2-Trichloroethane	MR	2	2011
Benzene	MR	2	2011
Styrene	MR	2	2011
Nitrate	MR	2	1999
1,2,4-Trichlorobenzene	MR	2	2011
cis-1,2-Dichloroethylene	MR	2	2011
Xylenes, Total	MR	2	2011
DICHLOROMETHANE	MR	2	2011
p-Dichlorobenzene	MR	2	2011
Tetrachloroethylene	MR	2	2011
CHLOROBENZENE	MR	2	2011
Public Notice	Other	2	2020
o-Dichlorobenzene	MR	2	2011
Gross Alpha, Excl. Radon and U	MR	2	1988
trans-1,2-Dichloroethylene	MR	2	2011
Toluene	MR	2	2011
1,1-Dichloroethylene	MR	2	2011

Yarnell Water Improvement Association

Yarnell Water Improvement Association standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Yarnell Water Improvement Association

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems with smaller service footprints