States → Montana

Non-Transient Non-Community Water System · PWS MT0001567

Arrowhead School District No 75

Belgrade, Montana 59714 - drinking water served from groundwater sources to 120 people, tracked in EPA SDWIS and UCMR5.

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

120
People served: 834
EPA violations: 4
Health-based: Untested
UCMR5 result

The verdict

EPA records 834 drinking-water violations at Arrowhead School District No 75 - above the Montana per-system average.

834
Total EPA violations on record: 0%
Health-based (MCL / treatment failure): 120
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Arrowhead School District No 75

Arrowhead School District No 75 is a state-owned non-transient non-community water system that delivers drinking water to 120 residents in Belgrade, Montana (Park County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 834 total violations for this system , of which 4 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 826 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Dalapon, recorded in 30 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Montana, EPA tracks 2,263 public water systems serving 1,112,267 people, with 297,270 cumulative violations and 25,922 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 131.4 violations. Statewide, 28 of 45 UCMR5-tested systems have reported PFAS detections (62.2%).

Arrowhead School District No 75's 834 violations sit above the Montana average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served

120

Total Violations

834

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Non-Transient Non-Community
Owner Type: State
Connections: 1
County: Park
School/Daycare: Yes
MCL Violations: 1
Monitoring Violations: 826
Treatment Tech Violations: 3

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Dalapon	MR	30	2020
Pentachlorophenol	MR	30	2020
Picloram	MR	30	2020
2,4-D	MR	30	2020
Dinoseb	MR	30	2020
2,4,5-TP	MR	30	2020
Endrin	MR	27	2020
BHC-GAMMA	MR	27	2020
Methoxychlor	MR	27	2020
Di(2-ethylhexyl) adipate	MR	27	2020
Di(2-ethylhexyl) phthalate	MR	27	2020
Hexachlorocyclopentadiene	MR	27	2020
Heptachlor	MR	27	2020
HEXACHLOROBENZENE	MR	27	2020
Benzo(a)pyrene	MR	27	2020
Chlordane	MR	27	2020
Carbofuran	MR	27	2020
Toxaphene	MR	27	2020
OXAMYL	MR	27	2020
Heptachlor epoxide	MR	27	2020
LASSO	MR	27	2020
Atrazine	MR	27	2020
Simazine	MR	27	2020
Coliform (TCR)	MR	21	2014
Lead and Copper Rule	MR	13	2021
Nitrate-Nitrite	MR	13	2023
Revised Total Coliform Rule	MON	10	2024
E. COLI	MR	4	2018
Diquat	MR	4	2020
Glyphosate	MR	4	2020

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Arrowhead School District No 75.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MT0001567 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Montana Drinking Water Authority

Montana's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find MT regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest)	Contaminant	Category	Count	EPA Record
2024	Revised Total Coliform Rule	MON	10	SDWIS / MT0001567 / 8000
2023	Nitrate-Nitrite	MR	13	SDWIS / MT0001567 / 1038
2021	Lead and Copper Rule	MR	13	SDWIS / MT0001567 / 5000
2020	Dalapon	MR	30	SDWIS / MT0001567 / 2031
2020	Pentachlorophenol	MR	30	SDWIS / MT0001567 / 2326
2020	Picloram	MR	30	SDWIS / MT0001567 / 2040
2020	2,4-D	MR	30	SDWIS / MT0001567 / 2105
2020	Dinoseb	MR	30	SDWIS / MT0001567 / 2041
2020	2,4,5-TP	MR	30	SDWIS / MT0001567 / 2110
2020	Endrin	MR	27	SDWIS / MT0001567 / 2005
2020	BHC-GAMMA	MR	27	SDWIS / MT0001567 / 2010
2020	Methoxychlor	MR	27	SDWIS / MT0001567 / 2015
2020	Di(2-ethylhexyl) adipate	MR	27	SDWIS / MT0001567 / 2035
2020	Di(2-ethylhexyl) phthalate	MR	27	SDWIS / MT0001567 / 2039
2020	Hexachlorocyclopentadiene	MR	27	SDWIS / MT0001567 / 2042

How Arrowhead School District No 75 Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric	Arrowhead School District No 75	Montana avg	Federal benchmark
Total violations	834	131.4	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	4	11.5	Indicates a contaminant exceeded a federal MCL
PFAS detection	None	62.2%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	120	492	Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,263 regulated public water systems in Montana.

Federal MCL reference, Safe Drinking Water Act thresholds ▼

Contaminant	Federal MCL / Action Level	Note
Lead	0 mg/L (Action Level: 0.015 mg/L)	Lead and Copper Rule treatment technique
Arsenic	0.010 mg/L (10 ppb)	Health-based MCL since 2006
Total Coliform	Treatment technique (RTCR)	Indicator organism, monitoring trigger
PFOA / PFOS (PFAS)	4.0 ppt each (final 2024 rule)	Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N)	10 mg/L	Acute health risk for infants

Frequently Asked Questions

Is Arrowhead School District No 75 water safe to drink? ▼

Arrowhead School District No 75 (PWS ID: MT0001567) has 834 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 120 people using Groundwater sources.

How many people does Arrowhead School District No 75 serve? ▼

Arrowhead School District No 75 serves 120 people in Belgrade, Montana. It is a State-owned system using Groundwater water sources with 1 service connections.

What type of violations does Arrowhead School District No 75 have? ▼

Arrowhead School District No 75 has 834 total violations: 4 health-based violations (MCL exceedances or treatment failures), 826 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Arrowhead School District No 75 water? ▼

No PFAS testing data is available for Arrowhead School District No 75 under the EPA's UCMR5 monitoring program.

What water source does Arrowhead School District No 75 use? ▼

Arrowhead School District No 75 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.

Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

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

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