Is Hollis Brookline Hs water safe to drink?

Hollis Brookline Hs (PWS ID: NH1175050) has 149 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 980 people using Groundwater sources.

How many people does Hollis Brookline Hs serve?

EPA SDWIS reports that Hollis Brookline Hs serves 980 people (this public water system's service population, not the municipal population of Hollis or any other city). It is a Local-owned system using Groundwater water sources with 1 service connections. The operator address is listed in Hollis, New Hampshire.

What type of violations does Hollis Brookline Hs have?

Hollis Brookline Hs has 149 total violations: 36 health-based violations (MCL exceedances or treatment failures), 110 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Hollis Brookline Hs water?

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

What water source does Hollis Brookline Hs use?

Hollis Brookline 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.

Where does Hollis Brookline Hs sit among U.S. public water systems?

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Hollis Brookline Hs ranks #20,039 of 29,740 by people served, and #131 of 284 in New Hampshire. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

How does Hollis Brookline Hs's violation count compare nationally?

Hollis Brookline Hs has 149 recorded EPA SDWIS violations, fewer than 19% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 81% of that cohort has fewer violations than Hollis Brookline 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 → New Hampshire

Non-Transient Non-Community Water System · PWS NH1175050

Hollis Brookline Hs

Operator location Hollis, New Hampshire - 24% of 149 violations are health-based (upper-third health share (> 23%)); groundwater source; 980 served per SDWIS.

Compiled by PlainWater · May 15, 2026

980
People served (this PWS) Smaller third of systems: 149
EPA violations (this PWS) Upper third of systems: 36
Health-based (this PWS) Upper third by health-based share: Untested
UCMR5 (this PWS) No UCMR5 result

Follow published updates (RSS)

Hollis Brookline Hs standing, high SDWIS violation third

24% of 149 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 24% is upper-third health share (> 23%). Population rank #20,039 of 29,740 among systems serving 500+.

The verdict

Hollis Brookline Hs sits in the upper third of the sitemap cohort by violation count (149), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (980; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 24% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.

#20,039 of 29,740
Population · /systems: #131 of 284
Population · NH: 149
Total EPA violations on record: 24%
Health-based (MCL / treatment failure)

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

Water Safety Score

5/100

Hollis Brookline 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 F

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

Monitoring & reporting violations F

113

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: Local
Connections: 1
County: Hillsborough
School/Daycare: Yes
MCL Violations: 36
Monitoring Violations: 110
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Antimony, Total	MCL	20	2009
Antimony, Total	MR	18	2011
Coliform (TCR)	MCL	16	2013
Arsenic	MR	8	2007
cis-1,2-Dichloroethylene	MR	4	2012
o-Dichlorobenzene	MR	4	2012
p-Dichlorobenzene	MR	4	2012
Vinyl chloride	MR	4	2012
1,1,1-Trichloroethane	MR	4	2012
Carbon tetrachloride	MR	4	2012
1,1,2-Trichloroethane	MR	4	2012
Tetrachloroethylene	MR	4	2012
Benzene	MR	4	2012
Toluene	MR	4	2012
1,2-Dichloroethane	MR	4	2012
Trichloroethylene	MR	4	2012
trans-1,2-Dichloroethylene	MR	4	2012
Xylenes, Total	MR	4	2012
1,2-Dichloropropane	MR	4	2012
1,2,4-Trichlorobenzene	MR	4	2012
CHLOROBENZENE	MR	4	2012
1,1-Dichloroethylene	MR	4	2012
Styrene	MR	4	2012
DICHLOROMETHANE	MR	4	2012
Ethylbenzene	MR	4	2012
Public Notice	Other	3	2013

Violation Count vs. the National Corpus

Hollis Brookline Hs has 149 recorded EPA violations, 81% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 19% carry more. 24% of this system's own violations are health-based (36 of 149), and it ranks #20,039 of 29,740 by population served among that same cohort.

EPA violations vs. the national water-system corpus

Public water systems serving 500+ people (EPA SDWIS)

149 Higher than most more violations than 81% 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

Hollis Brookline 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 Hollis Brookline 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
Hollis Brookline Hs: 149 violations, 24% health-based (this system)
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
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

Health-based violations on Hollis Brookline Hs

36 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH1175050.

EPA SDWIS · PWS NH1175050

Sources: EPA SDWIS

Nationwide peers

149 violations · 980 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

Cross-state systems with smaller service footprints

Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).

4 peers

What to do with Hollis Brookline Hs

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

See how every tracked system in New Hampshire compares on the same EPA violation measures. New Hampshire 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.