Water Quality in HOLLIS, NH (03049)

EPA violation data for public water systems serving ZIP code 03049.

101

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

99 of 101 violations have been resolved. 11 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 90 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 24 Population served: 5,559

Violations Detail (101 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
E. COLI	Monitoring	0	N/A	Jun 4, 2025	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Jun 4, 2025	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 20, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 20, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 20, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 20, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 20, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 20, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 23, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 23, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 23, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 23, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 23, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 23, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 10, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 2, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 2, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 2, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 2, 2024	Resolved	N/A
Di(2-ethylhexyl) phthalate	Health-Based	N/A	0.007	Jun 30, 2024	Resolved	N/A
Di(2-ethylhexyl) phthalate	Health-Based	N/A	0.007	Jun 30, 2024	Resolved	N/A
Di(2-ethylhexyl) phthalate	Health-Based	N/A	0.007	Jun 30, 2024	Resolved	N/A
Nitrite	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrite	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrite	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrite	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
E. COLI	Monitoring	0	N/A	Jan 4, 2024	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Jan 4, 2024	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Jan 4, 2024	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Jan 4, 2024	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 21, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 21, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 21, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 21, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	235	Sep 30, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	235	Sep 30, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	235	Sep 30, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	235	Sep 30, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	298	Jun 30, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	298	Jun 30, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	298	Jun 30, 2022	Resolved	N/A
Combined Uranium	Health-Based	N/A	298	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 7, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2022	Resolved	N/A
E. COLI	Monitoring	0	N/A	Sep 15, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Sep 15, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Sep 15, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Sep 15, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A

Violation Timeline

2025(34)

E. COLI

Jun 4Active

E. COLI

Jun 4Active

Revised Total Coliform Rule

May 8Resolved

Revised Total Coliform Rule

May 8Resolved

Revised Total Coliform Rule

May 8Resolved

Revised Total Coliform Rule

May 8Resolved

Public Notice

Apr 20Resolved

Public Notice

Apr 20Resolved

Public Notice

Apr 20Resolved

Public Notice

Apr 20Resolved

Public Notice

Apr 20Resolved

Public Notice

Apr 20Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Public Notice

Mar 23Resolved

Public Notice

Mar 23Resolved

Public Notice

Mar 23Resolved

Public Notice

Mar 23Resolved

Public Notice

Mar 23Resolved

Public Notice

Mar 23Resolved

Revised Total Coliform Rule

Mar 10Resolved

Revised Total Coliform Rule

Mar 10Resolved

Revised Total Coliform Rule

Mar 10Resolved

Revised Total Coliform Rule

Mar 10Resolved

Revised Total Coliform Rule

Feb 10Resolved

Revised Total Coliform Rule

Feb 10Resolved

Revised Total Coliform Rule

Feb 10Resolved

Revised Total Coliform Rule

Feb 10Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

2024(23)

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Public Notice

Dec 2Resolved

Public Notice

Dec 2Resolved

Public Notice

Dec 2Resolved

Public Notice

Dec 2Resolved

Di(2-ethylhexyl) phthalate

Jun 30Resolved

Di(2-ethylhexyl) phthalate

Jun 30Resolved

Di(2-ethylhexyl) phthalate

Jun 30Resolved

Nitrite

Jun 30Resolved

Nitrite

Jun 30Resolved

Nitrite

Jun 30Resolved

Nitrite

Jun 30Resolved

Nitrate

Jun 30Resolved

Nitrate

Jun 30Resolved

Nitrate

Jun 30Resolved

Nitrate

Jun 30Resolved

E. COLI

Jan 4Resolved

E. COLI

Jan 4Resolved

E. COLI

Jan 4Resolved

E. COLI

Jan 4Resolved

How Does This Compare?

HOLLIS (03049) has 101 recorded violations, including 11 health-based. 2 remain unresolved. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

Reverse Osmosis System

One of the few filtration methods effective at removing nitrates and nitrites. Essential for households with infants.

Targets:Nitrate, Nitrite, Dissolved Solids

Look for:NSF/ANSI 58 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

UV Water Purifier

Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.

Targets:E. coli, Coliform, Giardia, Cryptosporidium

Look for:NSF/ANSI 55 (Class A) certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.

Water Quality in HOLLIS, NH (03049)

What does this mean?

Violations Detail (101 total)

Violation Timeline

2025(34)

2024(23)

2023(16)

2022(14)

2021(14)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

UV Water Purifier

Nearby ZIP Codes

Check Another ZIP Code