Question 1

Is Grayling High School water safe to drink?

Accepted Answer

Grayling High School (PWS ID: MI2006420) has 127 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 530 people using Groundwater sources.

Question 2

How many people does Grayling High School serve?

Accepted Answer

EPA SDWIS reports that Grayling High School serves 530 people (this public water system's service population, not the municipal population of Grayling or any other city). It is a Private-owned system using Groundwater water sources with 1 service connections. The operator address is listed in Grayling, Michigan.

Question 3

What type of violations does Grayling High School have?

Accepted Answer

Grayling High School has 127 total violations: 4 health-based violations (MCL exceedances or treatment failures), 121 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 Grayling High School water?

Accepted Answer

No PFAS testing data is available for Grayling High School under the EPA's UCMR5 monitoring program.

Question 5

What water source does Grayling High School use?

Accepted Answer

Grayling High School uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.

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 Grayling High School sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Grayling High School ranks #27,927 of 29,740 by people served, and #1,172 of 1,375 in Michigan. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Grayling High School's violation count compare nationally?

Accepted Answer

Grayling High School has 127 recorded EPA SDWIS violations, fewer than 22% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 78% of that cohort has fewer violations than Grayling High School. 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
Lead and Copper Rule	MR	6	2018
Nitrate	MR	4	2004
Coliform (TCR)	MR	4	2004
Coliform (TCR)	MCL	4	2006
Arsenic	MR	4	2020
Revised Total Coliform Rule	MON	3	2025
Barium	MR	2	2002
Cadmium	MR	2	2002
Mercury	MR	2	2002
Selenium	MR	2	2002
Beryllium, Total	MR	2	2002
Thallium, Total	MR	2	2002
BHC-GAMMA	MR	2	1999
Methoxychlor	MR	2	1999
Toxaphene	MR	2	1999
Simazine	MR	2	1999
Dinoseb	MR	2	1999
Hexachlorocyclopentadiene	MR	2	1999
Atrazine	MR	2	1999
LASSO	MR	2	1999
Heptachlor epoxide	MR	2	1999
2,4,5-TP	MR	2	1999
HEXACHLOROBENZENE	MR	2	1999
Pentachlorophenol	MR	2	1999
1,2,4-Trichlorobenzene	MR	2	1999
cis-1,2-Dichloroethylene	MR	2	1999
DICHLOROMETHANE	MR	2	1999
o-Dichlorobenzene	MR	2	1999
p-Dichlorobenzene	MR	2	1999
Vinyl chloride	MR	2	1999

Grayling High School

Grayling High School standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Grayling High School

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems with smaller service footprints