CREST HILL, ILLINOIS · 2025 WATER DATA
Is Crest Hill's water good enough for your family?
Crest Hill's water meets federal standards. But a legal limit is not a health goal. Every figure on this page comes from City of Crest Hill's published reporting — and every one is system-wide, not from your tap.
THE SUPPLIER
City of Crest Hill
Groundwater from the City's wells, disinfected with chlorine before it reaches the distribution system.
Source: City of Crest Hill 2025 Consumer Confidence Report
- Crest Hill's public service line map lists no lead service lines, but 5,295 of 6,729 are still unknown and 138 customer-owned lines are galvanized requiring replacement.
- In 2025 sampling, lead measured 1.23 ppb at the 90th percentile, below the 15 ppb action level, with 1 site above the action level.
- Total trihalomethanes, a chlorine disinfection by-product, measured 32–54 ppb in 2025, under the 80 ppb limit.
- Crest Hill is a member of the Grand Prairie Water Commission, which expects to deliver Lake Michigan water to member communities by 2030.
Two things to know
These are town-wide results. What comes out of your tap also depends on your own pipes and faucets. A town report can't see inside your house.
Legal limit isn't the same as the health goal. The legal limit is the most the law allows. The health goal is the level with no known risk. For lead, the health goal is 0.
CREST HILL WATER REPORT CARD
What Crest Hill's own water reports show.
Here's what Crest Hill's own water reports say, in plain English. Green means it looks good. Yellow means keep an eye on it. Red means it needs attention.
ppb = parts per billion. 1 ppb is about 1 drop of water in a backyard swimming pool.
The short version
- Some tested homes were over the lead action level
- Chlorine by-products (TTHM) found, under the legal limit
- Some street pipes are still unknown
- Chlorine by-products (HAA5) found, under the legal limit
- Some copper found, under the action level
- Some homes were built before lead solder was banned
Lead in tested homes
Lead · 90th percentile
Needs attention
The town tests tap water in homes most likely to have lead. 9 out of 10 of those homes had this much or less.
1.23 ppb
parts per billion
Action level: if more than 1 in 10 tested homes go over this, the town must take extra steps.
1 tested home had more lead than the 15 ppb action level. A drinking-water filter certified for lead can help.
Chlorine by-products
Total trihalomethanes (TTHM)
Keep an eye on it
Leftovers that form when chlorine cleans the water. The law limits them because drinking too much over many years may raise health risks.
54 ppb
parts per billion
Legal limit: the most the law allows.
Highest single test: 54 ppb
Under the 80 ppb legal limit, but it's there. A certified filter can lower it at your kitchen sink.
Lead water pipes from the street
Service-line inventory
Keep an eye on it
A service line is the underground pipe that brings water from the street into a building. Some old ones are made of lead.
5,295 of 6,729 street water pipes are still unknown
About 8 in 10
- Lead pipe: 0
- Old steel pipe that needs replacing (galvanized): 138
- Not known yet: 5,295
- Not lead: 1,296
The City's map tracks the City-owned and customer-owned parts of each line separately and lists no lead on either side. A line counts as unknown here if either part is unknown; the City-owned part is still unknown at most addresses.
5,295 pipes are still listed as unknown. Worth checking your address.
From the town's list, as of August 15, 2025.
Source: City of Crest Hill water service line inventory dashboard (data last updated August 15, 2025)
Older homes
Homes built before 1980
Good to know
Lead solder and lead pipes were allowed in homes until 1986.
40.9%of Crest Hill homes were built before 1980 — about 4 in 10Older homes are more likely to have lead solder inside.
Source: U.S. Census Bureau, ACS 2024 5-year estimates (B25034)
Tested homes over the lead limit
Lead sampling
Needs attention
1tested homes had more lead than the 15 ppb action level1 tested home had more lead than the 15 ppb action level. A drinking-water filter certified for lead can help.
More chlorine by-products
Haloacetic acids (HAA5)
Keep an eye on it
Another group of chlorine leftovers, also limited by law.
25 ppb
parts per billion
Legal limit: the most the law allows.
Highest single test: 25 ppb
Under the 60 ppb legal limit, but it's there. Our filter claims cover TTHM, not HAA5 specifically.
Copper in tested homes
Copper · 90th percentile
Keep an eye on it
Copper can get into water from pipes inside homes.
1.28 ppm
parts per million
Action level: if more than 1 in 10 tested homes go over this, the town must take extra steps.
Under the 1.3 ppm action level. Copper usually comes from pipes inside the home.
Chlorine
Disinfectant residual
Good to know
Chlorine is added on purpose to kill germs in the pipes. The legal limit is 4 ppm.
0.9 ppmparts per million
Added on purpose to kill germs. It's the most common reason water tastes or smells like a pool.
Typical home age
Median year built
Good to know
Half of Crest Hill's homes were built before this year.
1992Older homes are more likely to have lead solder inside.
Source: U.S. Census Bureau, ACS 2024 5-year estimates (B25035)
Where the water comes from
Groundwater from the City's wells, disinfected with chlorine before it reaches the distribution system.
WATER WORDS, EXPLAINED
What these Crest Hill water report words mean
- ppb (parts per billion)
- 1 ppb is about 1 drop of water in a backyard swimming pool.
- ppm (parts per million)
- 1,000 times more than a ppb — about 1 drop in 13 gallons.
- Legal limit (MCL)
- The most of something the law allows in public drinking water.
- Action level
- A trigger for lead and copper. If more than 1 in 10 tested homes are over it, the water system must take extra steps.
- Health goal (MCLG)
- The level with no known health risk. For lead, it's 0. Health goals are not legal limits.
- 90th percentile
- Line up all the test results from lowest to highest. The 90th percentile is the number that 9 out of 10 results are at or below.
- Service line
- The underground pipe that carries water from the main under the street into a building.
- Galvanized pipe that needs replacing
- An old steel pipe coated in zinc. If it was ever connected after a lead pipe, it can hold lead and must be replaced.
- TTHM (total trihalomethanes)
- Leftovers that form when chlorine mixes with natural material in water. The law limits them because drinking too much over many years may raise health risks.
- HAA5 (haloacetic acids)
- Another group of chlorine leftovers, also limited by law.
- PFAS
- A big family of man-made chemicals, sometimes called "forever chemicals" because they break down very slowly.
- Reverse osmosis (RO)
- A filter that pushes water through a very fine layer to remove many things. It sits under the kitchen sink and gives you one tap of filtered drinking water.
- Whole-home carbon filter
- A large filter where water enters the house. It removes chlorine taste and smell at every tap.
- Water softener
- Removes the minerals that make water "hard" — the white spots and scale. It does not remove lead.
- NSF/ANSI certification
- An independent lab test proving a filter really reduces what it claims. We list the exact certificate on your quote.
WHICH FILTER FIXES WHAT
Which filter fixes which problem?
Find your problem on the left. A green check means that system helps.
Yes, it helps Only certain models No, it doesn't
| Water problem | Under-sink ROFilters drinking water at the kitchen sinkfrom $1,195 | Whole-home carbonFilters all the water coming into your housefrom $1,795 | Water softenerStops hard-water spots and scalefrom $1,795 | Complete Home SystemAll three togetherfrom $2,699 |
|---|---|---|---|---|
| Lead | Yes — certified to reduce lead (NSF/ANSI 53/58) | No — doesn't remove lead | No — doesn't remove lead | Yes — at the kitchen sink (through the RO) |
| Chlorine by-products (TTHM) | Yes — certified to reduce TTHM (NSF/ANSI 53/58) | Only some models — ask for NSF/ANSI 53 | No | Yes — at the kitchen sink (through the RO) |
| Chlorine taste & smell | Yes — at the kitchen sink | Yes — at every tap (NSF/ANSI 42) | No | Yes — at every tap |
| Hard water & scale | No — not a softener | No — not a softener | Yes — sized to your water (NSF/ANSI 44) | Yes — whole house |
| PFAS ("forever chemicals") | Yes — certified to reduce PFOA/PFOS (NSF/ANSI 53/58) | No — not certified for PFAS | No | Yes — at the kitchen sink (through the RO) |
Lead
- Under-sink ROFilters drinking water at the kitchen sinkYes — certified to reduce lead (NSF/ANSI 53/58)
- Whole-home carbonFilters all the water coming into your houseNo — doesn't remove lead
- Water softenerStops hard-water spots and scaleNo — doesn't remove lead
- Complete Home SystemAll three togetherYes — at the kitchen sink (through the RO)
Chlorine by-products (TTHM)
- Under-sink ROFilters drinking water at the kitchen sinkYes — certified to reduce TTHM (NSF/ANSI 53/58)
- Whole-home carbonFilters all the water coming into your houseOnly some models — ask for NSF/ANSI 53
- Water softenerStops hard-water spots and scaleNo
- Complete Home SystemAll three togetherYes — at the kitchen sink (through the RO)
Chlorine taste & smell
- Under-sink ROFilters drinking water at the kitchen sinkYes — at the kitchen sink
- Whole-home carbonFilters all the water coming into your houseYes — at every tap (NSF/ANSI 42)
- Water softenerStops hard-water spots and scaleNo
- Complete Home SystemAll three togetherYes — at every tap
Hard water & scale
- Under-sink ROFilters drinking water at the kitchen sinkNo — not a softener
- Whole-home carbonFilters all the water coming into your houseNo — not a softener
- Water softenerStops hard-water spots and scaleYes — sized to your water (NSF/ANSI 44)
- Complete Home SystemAll three togetherYes — whole house
PFAS ("forever chemicals")
- Under-sink ROFilters drinking water at the kitchen sinkYes — certified to reduce PFOA/PFOS (NSF/ANSI 53/58)
- Whole-home carbonFilters all the water coming into your houseNo — not certified for PFAS
- Water softenerStops hard-water spots and scaleNo
- Complete Home SystemAll three togetherYes — at the kitchen sink (through the RO)
Filter claims apply to the exact certified model named on your quote, used and maintained the way the maker says.
COMPLIANCE
Reported compliance notes
The 2025 report lists routine monitoring violations (January 2023–December 2025) for a number of regulated contaminants, including antimony, arsenic, barium, fluoride, and mercury, where required tests were not completed for the period. These are missed tests, not results over a limit.
Source: City of Crest Hill
Under the Lead and Copper Rule, the report lists a violation for not proposing corrosion-control treatment to regulators after results indicated treatment was needed, and for not certifying that annual notices were delivered to customers with lead, galvanized-requiring-replacement, or unknown service lines.
Source: City of Crest Hill
What this page cannot tell you
These are town-wide results. What comes out of your tap also depends on your own pipes and faucets. The only way to know for sure is to test your own water — we'll tell you that even when it means you don't buy anything from us.
FREE PDF GUIDE
The Crest Hill Safe Water Guide
Your town's water numbers in plain English, free habits that lower lead, how to pick a certified pitcher filter, and when a permanent system makes sense. Sent to your inbox.
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