Is Armstrong Twp Hs water safe to drink?

Armstrong Twp Hs (PWS ID: IL3005587) has 95 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 162 people using Groundwater sources.

How many people does Armstrong Twp Hs serve?

EPA SDWIS reports that Armstrong Twp Hs serves 162 people (this public water system's service population, not the municipal population of Armstrong or any other city). It is a Public/Private-owned system using Groundwater water sources with 1 service connections. The operator address is listed in Armstrong, Illinois.

What type of violations does Armstrong Twp Hs have?

Armstrong Twp Hs has 95 total violations: 2 health-based violations (MCL exceedances or treatment failures), 93 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Armstrong Twp Hs water?

No PFAS testing data is available for Armstrong Twp Hs under the EPA's UCMR5 monitoring program.

What water source does Armstrong Twp Hs use?

Armstrong Twp Hs 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.

Where does this data come from?

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.

How does Armstrong Twp Hs's violation count compare nationally?

Armstrong Twp Hs has 95 recorded EPA SDWIS violations, fewer than 28% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 72% of that cohort has fewer violations than Armstrong Twp Hs. 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.

States → Illinois

Non-Transient Non-Community Water System · PWS IL3005587

Armstrong Twp Hs

Operator location Armstrong, Illinois - smaller served population (≤ 999) at 162 people served; 95 SDWIS violations on record from groundwater sources.

Compiled by PlainWater · May 15, 2026

162
People served (this PWS) Smaller third of systems: 95
EPA violations (this PWS) Upper third of systems: 2
Health-based (this PWS) Middle third by health-based share: Untested
UCMR5 (this PWS) No UCMR5 result

Follow published updates (RSS)

Armstrong Twp Hs standing, high SDWIS violation third

162 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%).

The verdict

Armstrong Twp Hs sits in the upper third of the sitemap cohort by violation count (95), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (162; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 2% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.

95
Total EPA violations on record: 2%
Health-based (MCL / treatment failure): 162
People served by this PWS (SDWIS): N/A
PFAS compounds detected (UCMR5)

Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.

Water Safety Score

39/100

Armstrong Twp Hs

Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.

Health-based violations C-

EPA SDWIS health-based violations on record (MCL, MRDL, treatment technique)

Monitoring & reporting violations F

Non-health SDWIS violations (monitoring, reporting, and other compliance)

PFAS contamination N/A

Not UCMR5-tested

Highest PFAS compound level detected in UCMR5 testing

System Details

System Type: Non-Transient Non-Community
Owner Type: Public/Private
Connections: 1
County: Vermilion
School/Daycare: Yes
MCL Violations: 2
Monitoring Violations: 93
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	3	2006
Barium	MR	2	1996
Cadmium	MR	2	1996
CYANIDE	MR	2	1996
Mercury	MR	2	1996
BHC-GAMMA	MR	2	1996
Carbofuran	MR	2	1996
Atrazine	MR	2	1996
Heptachlor	MR	2	1996
Heptachlor epoxide	MR	2	1996
2,4-D	MR	2	1996
2,4,5-TP	MR	2	1996
Pentachlorophenol	MR	2	1996
1,2-DIBROMO-3-CHLOROPROPANE	MR	2	1996
ETHYLENE DIBROMIDE	MR	2	1996
Chlordane	MR	2	1996
1,2,4-Trichlorobenzene	MR	2	1996
Xylenes, Total	MR	2	1996
DICHLOROMETHANE	MR	2	1996
p-Dichlorobenzene	MR	2	1996
Vinyl chloride	MR	2	1996
trans-1,2-Dichloroethylene	MR	2	1996
1,2-Dichloroethane	MR	2	1996
Carbon tetrachloride	MR	2	1996
1,1,2-Trichloroethane	MR	2	1996
CHLOROBENZENE	MR	2	1996
Benzene	MR	2	1996
Toluene	MR	2	1996
Ethylbenzene	MR	2	1996
Coliform (TCR)	MCL	2	2006

Violation Count vs. the National Corpus

Armstrong Twp Hs has 95 recorded EPA violations, 72% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 28% carry more. 2% of this system's own violations are health-based (2 of 95), and it ranks unranked by population served among that same cohort.

EPA violations vs. the national water-system corpus

Public water systems serving 500+ people (EPA SDWIS)

95 Around the middle fewer violations than 28% of 29,740 water systems

the national water-system corpus, bucketed by value

Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source EPA SDWIS · 2026-05-15

How many violations vs. how serious, among peer systems

Armstrong Twp Hs plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.

30 public water systems (500+ people served), EPA SDWIS current release.

How to read this

Each dot is one public water system; the highlighted dot is Armstrong Twp Hs. A system to the right has more recorded violations; a system higher up has a larger share of those violations classified health-based rather than monitoring or reporting.

Rare but serious: few violations, but most of them are health-based.
Frequent, mostly paperwork: many violations, but mostly monitoring or reporting, not health-based.
Clean record: below-median on both counts, the tinted corner.

View all 30 systems as a list

City of Ballinger: 372 violations, 85% health-based
Nooksack Valley Water Association: 16 violations, 31% health-based
Montgomery Co RWD 12: 7 violations, 29% health-based
Irvin Water District #6: 11 violations, 27% health-based
Ticonderoga WD: 47 violations, 26% health-based
Pine Valley Plantation: 37 violations, 24% health-based
McLouth, City Of: 29 violations, 17% health-based
Kipling Oaks 1: 25 violations, 16% health-based
South Deerfield Water Supply District: 96 violations, 16% health-based
Sunset Ridge Water District: 82 violations, 15% health-based
Orange Water Dept: 136 violations, 14% health-based
Mount Pleasant Water Sys #1: 167 violations, 11% health-based
Lake Gibson Estates: 42 violations, 2% health-based
Armstrong Twp Hs: 95 violations, 2% health-based (this system)
Benson Culinary Improvement District: 212 violations, 1% health-based
Conemaugh Twp Muni Auth: 567 violations, 1% health-based
Miccosukee Service Plaza: 0 violations, 0% health-based
Brazoria - Fort Bend Counties MUD 3: 0 violations, 0% health-based
Tanglewilde Thompson Place 600: 2 violations, 0% health-based
Center Water Co: 5 violations, 0% health-based
Spring Mills Elem School/Hvs: 9 violations, 0% health-based
Great Bend Industrial Park: 14 violations, 0% health-based
Glen Park Village: 19 violations, 0% health-based
Camp Is-Sho-Da: 22 violations, 0% health-based
Hamilton: 33 violations, 0% health-based
Town of Welaka: 54 violations, 0% health-based
Township of Blairstown Dpw: 61 violations, 0% health-based
McIntosh Water & Fire Pro Authority: 71 violations, 0% health-based
Clarkdale Municipal Water System: 114 violations, 0% health-based
Eureka Water Association: 273 violations, 0% health-based

Population served record for Armstrong Twp Hs

EPA SDWIS lists 162 people served and 1 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.

EPA SDWIS · PWS IL3005587 IL primacy agency

Sources: EPA SDWIS · Illinois EPA, Bureau of Water

Nationwide peers

95 violations · 162 served: nearest cross-state SDWIS matches.

Cross-state systems with comparable violation load

Nearest cross-state community systems (500+ served) by total SDWIS violations on record.

4 peers

What to do with Armstrong Twp Hs

Use this system's EPA-reported record as a starting filter, not a final verdict.

See how every tracked system in Illinois compares on the same EPA violation measures. Illinois systems
Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
Find and compare another public water system by name or PWSID. Search systems

EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.