Maryland · ZIP 21629 · EPA MD0050004

Is this in Denton's water?

Jonestown Water System · serves 150 people · groundwater · 56 connections
13
violations on the federal EPA record
0
health-based — a protective limit exceeded
150
people drink this water every day

On paper this system is compliant, but the EPA record shows 13 violations — mostly missed testing or reporting. What isn't measured can't be caught.

Ground Water Rule

The Ground Water Rule protects wells and aquifer-fed systems from fecal contamination through source-water monitoring and fixes.

Read the rule → EPA · Ground Water Rule
Haloacetic Acids (HAA5)

Haloacetic acids are disinfection byproducts formed when chlorine treats water; five are federally capped as a group.

Read the rule → EPA · Disinfection Byproducts Rules
Lead & Copper Rule

The Lead & Copper Rule requires utilities to test water at customer taps for lead and copper — metals that enter water from pipes and plumbing, not the source. Lead harms brain development in children; no level is considered safe.

Read the rule → EPA · Lead & Copper Rule
Surface Water Treatment

The Surface Water Treatment Rules require utilities using surface water (or groundwater under its influence) to filter and disinfect against microbes like Giardia, Legionella and viruses.

Read the rule → EPA · Surface Water Treatment Rules
Total Trihalomethanes (TTHM)

Total trihalomethanes are cancer-linked byproducts formed when chlorine disinfects water; federal rules cap them and require regular testing.

Read the rule → EPA · Disinfection Byproducts Rules

The federal record.

RECORDmissed required testing or reportingLead & Copper Rule1997

The utility didn't complete required testing or paperwork on time. The water wasn't necessarily bad — but what isn't measured can't be caught.

Lead & Copper Rule: The Lead & Copper Rule requires utilities to test water at customer taps for lead and copper — metals that enter water from pipes and plumbing, not the source. Lead harms brain development in children; no level is considered safe.

Read the rule → EPA · Lead & Copper Rule
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDother violationSurface Water Treatment2007

A violation on the federal record outside the standard categories.

Surface Water Treatment: The Surface Water Treatment Rules require utilities using surface water (or groundwater under its influence) to filter and disinfect against microbes like Giardia, Legionella and viruses.

Read the rule → EPA · Surface Water Treatment Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDmissed required testing or reportingLead & Copper Rule2007

The utility didn't complete required testing or paperwork on time. The water wasn't necessarily bad — but what isn't measured can't be caught.

Lead & Copper Rule: The Lead & Copper Rule requires utilities to test water at customer taps for lead and copper — metals that enter water from pipes and plumbing, not the source. Lead harms brain development in children; no level is considered safe.

Read the rule → EPA · Lead & Copper Rule
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDother violationSurface Water Treatment2008

A violation on the federal record outside the standard categories.

Surface Water Treatment: The Surface Water Treatment Rules require utilities using surface water (or groundwater under its influence) to filter and disinfect against microbes like Giardia, Legionella and viruses.

Read the rule → EPA · Surface Water Treatment Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDother violationSurface Water Treatment2011

A violation on the federal record outside the standard categories.

Surface Water Treatment: The Surface Water Treatment Rules require utilities using surface water (or groundwater under its influence) to filter and disinfect against microbes like Giardia, Legionella and viruses.

Read the rule → EPA · Surface Water Treatment Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDother violationSurface Water Treatment2008

A violation on the federal record outside the standard categories.

Surface Water Treatment: The Surface Water Treatment Rules require utilities using surface water (or groundwater under its influence) to filter and disinfect against microbes like Giardia, Legionella and viruses.

Read the rule → EPA · Surface Water Treatment Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDother violationSurface Water Treatment2012

A violation on the federal record outside the standard categories.

Surface Water Treatment: The Surface Water Treatment Rules require utilities using surface water (or groundwater under its influence) to filter and disinfect against microbes like Giardia, Legionella and viruses.

Read the rule → EPA · Surface Water Treatment Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDother violationSurface Water Treatment2011

A violation on the federal record outside the standard categories.

Surface Water Treatment: The Surface Water Treatment Rules require utilities using surface water (or groundwater under its influence) to filter and disinfect against microbes like Giardia, Legionella and viruses.

Read the rule → EPA · Surface Water Treatment Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDmissed required testing or reportingTotal Trihalomethanes (TTHM)2015

The utility didn't complete required testing or paperwork on time. The water wasn't necessarily bad — but what isn't measured can't be caught.

Total Trihalomethanes (TTHM): Total trihalomethanes are cancer-linked byproducts formed when chlorine disinfects water; federal rules cap them and require regular testing.

Read the rule → EPA · Disinfection Byproducts Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDmissed required testing or reportingHaloacetic Acids (HAA5)2015

The utility didn't complete required testing or paperwork on time. The water wasn't necessarily bad — but what isn't measured can't be caught.

Haloacetic Acids (HAA5): Haloacetic acids are disinfection byproducts formed when chlorine treats water; five are federally capped as a group.

Read the rule → EPA · Disinfection Byproducts Rules
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDmissed required testing or reporting2018

The utility didn't complete required testing or paperwork on time. The water wasn't necessarily bad — but what isn't measured can't be caught.

Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDmissed required testing or reportingLead & Copper Rule2021

The utility didn't complete required testing or paperwork on time. The water wasn't necessarily bad — but what isn't measured can't be caught.

Lead & Copper Rule: The Lead & Copper Rule requires utilities to test water at customer taps for lead and copper — metals that enter water from pipes and plumbing, not the source. Lead harms brain development in children; no level is considered safe.

Read the rule → EPA · Lead & Copper Rule
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗
RECORDlate or missing reportGround Water Rule2025

A required report to regulators or the public was late or missing.

Ground Water Rule: The Ground Water Rule protects wells and aquifer-fed systems from fecal contamination through source-water monitoring and fixes.

Read the rule → EPA · Ground Water Rule
Who is responsibleJonestown Water System · attn Brown, Kevin · 410-479-0520 — the utility is required to answer questions about its record. Ask them about it.Their office: CAROLINE COUNTY PUBLIC WORKS, Denton ↗

Source: U.S. EPA Safe Drinking Water Information System (SDWIS), system MD0050004. “Compliant” means clearing federal limits — many unchanged for ~20 years. Health guidelines from independent scientists are often stricter. Results vary by home, plumbing and date.

Fix it, honestly.

Dissolved metals · nitrate

Reverse osmosis

NSF-58 certified under-sink RO — the only tech that broadly removes dissolved contaminants at the tap.

Chlorine · taste · odor

Catalytic carbon

NSF-42 whole-house carbon cuts chlorine, chloramine and the pool-water taste.

First step

Filter bottle

Certified grab-and-go protection while you decide on the whole-home fix.